用 Java 设计一个计算器
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时间：2020-10-31 07:17:57 来源:igfitidea点击:
Designing a Calculator in Java
提问by
I'm new in Java and I'm finding it hard to implement a GUI here unlike in Visual Basic.
我是 Java 新手，我发现这里很难实现与 Visual Basic 不同的 GUI。
import javax.swing.*;
import java.awt.*;
public class CalculatorGui extends JFrame{
private static final int WIDTH = 250;
private static final int HEIGHT = 250;
private JTextField enterTextField;
private JButton sevenB, eightB, nineB, divideB, fourB, fiveB, sixB, multiplyB, oneB, twoB, threeB, subtractB, zeroB, dotB, equalsB, addB;
public CalculatorGui() {
setTitle("Calculator");
setSize(WIDTH, HEIGHT);
setLayout(new GridLayout(4, 4));
enterTextField = new JTextField(30);
sevenB = new JButton("7");
eightB = new JButton("8");
nineB = new JButton("9");
divideB = new JButton("/");
fourB = new JButton("4");
fiveB = new JButton("5");
sixB = new JButton("6");
multiplyB = new JButton("*");
oneB = new JButton("1");
twoB = new JButton("2");
threeB = new JButton("3");
subtractB = new JButton("-");
zeroB = new JButton("0");
dotB = new JButton(".");
equalsB = new JButton("=");
addB = new JButton("+");
/*JPanel dataPanel = new JPanel();
JPanel buttonPanel = new JPanel();
FlowLayout flowCenter = new FlowLayout(FlowLayout.RIGHT);
GridLayout aGrid = new GridLayout(4, 4);
buttonPanel.setLayout(flowCenter);
dataPanel.setLayout(aGrid);
dataPanel.add(enterTextField);
buttonPanel.add(sevenB);
buttonPanel.add(eightB);
buttonPanel.add(nineB);
buttonPanel.add(divideB);
buttonPanel.add(fourB);
buttonPanel.add(fiveB);
buttonPanel.add(sixB);
buttonPanel.add(multiplyB);
buttonPanel.add(oneB);
buttonPanel.add(twoB);
buttonPanel.add(threeB);
buttonPanel.add(subtractB);
buttonPanel.add(zeroB);
buttonPanel.add(dotB);
buttonPanel.add(equalsB);
buttonPanel.add(addB);
add(dataPanel, BorderLayout.NORTH);
add(buttonPanel, BorderLayout.CENTER);*/
//add(enterTextField);
add(sevenB);
add(eightB);
add(nineB);
add(divideB);
add(fourB);
add(fiveB);
add(sixB);
add(multiplyB);
add(oneB);
add(twoB);
add(threeB);
add(subtractB);
add(zeroB);
add(dotB);
add(equalsB);
add(addB);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
public static void main(String[] args) {
CalculatorGui calcu = new CalculatorGui();
}
}
It runs but I need to put a text field right before those buttons(numbers). The text field should flowand will not be enlarged when the window is maximized (unlike the 4x4 buttons). I've tried JPanel(see comments) but it outputs a horrible design. P
它运行但我需要在这些按钮（数字）之前放置一个文本字段。当窗口最大化时，文本字段应该流动并且不会被放大（与 4x4 按钮不同）。我试过JPanel（见评论），但它输出了一个可怕的设计。磷
采纳答案by Harmeet Singh
Here you go, with some rules to follow while building GUI (rules):
Do not subclass AWT/Swing/X Components for application needs
开始吧，在构建 GUI 时要遵循一些规则（规则）：
不要子类化 AWT/Swing/X 组件以满足应用程序需求
import java.awt.BorderLayout;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class CalculatorGui {
private static final int WIDTH = 250;
private static final int HEIGHT = 250;
private JTextField enterTextField;
private JButton sevenB, eightB, nineB, divideB, fourB, fiveB, sixB, multiplyB, oneB, twoB, threeB, subtractB, zeroB, dotB, equalsB, addB;
public CalculatorGui() {
JFrame frame = new JFrame("Calculator");
frame.setTitle("Calculator");
frame.setSize(WIDTH, HEIGHT);
JPanel buttonPanel = new JPanel(new GridLayout(4, 4));
enterTextField = new JTextField();
frame.add(enterTextField, BorderLayout.NORTH);
sevenB = new JButton("7");
eightB = new JButton("8");
nineB = new JButton("9");
divideB = new JButton("/");
fourB = new JButton("4");
fiveB = new JButton("5");
sixB = new JButton("6");
multiplyB = new JButton("*");
oneB = new JButton("1");
twoB = new JButton("2");
threeB = new JButton("3");
subtractB = new JButton("-");
zeroB = new JButton("0");
dotB = new JButton(".");
equalsB = new JButton("=");
addB = new JButton("+");
buttonPanel.add(sevenB);
buttonPanel.add(eightB);
buttonPanel.add(nineB);
buttonPanel.add(divideB);
buttonPanel.add(fourB);
buttonPanel.add(fiveB);
buttonPanel.add(sixB);
buttonPanel.add(multiplyB);
buttonPanel.add(oneB);
buttonPanel.add(twoB);
buttonPanel.add(threeB);
buttonPanel.add(subtractB);
buttonPanel.add(zeroB);
buttonPanel.add(dotB);
buttonPanel.add(equalsB);
buttonPanel.add(addB);
frame.add(buttonPanel, BorderLayout.CENTER);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
public static void main(String[] args) {
CalculatorGui calcu = new CalculatorGui();
}
}
I would suggest you to use WindowsBuilder Proafter a good manual practice with some layoutsand components
我建议你使用WindowsBuilder Pro的一些良好的手工做法后layouts和components
回答by Harmeet Singh
I am new, but i have a code for designing a calculator using AWT.It is only a sample.
我是新手，但我有一个使用 AWT 设计计算器的代码。它只是一个示例。
import java.awt.*;
public class Calculator extends Frame
{
public Calculator(String s)
{
String buttonString = "789/456*123-0.=+";
for (int i = 0, x=0,y=50; i
Button b = new Button(buttonString.substring(i, i + 1));
b.setBounds(x, y, 50, 50);
add(b);
if((i+1)%4==0)
{
x=0;
y+=50;
}
else
{
x=x+50;
}
}
TextField txtField=new TextField("0");
txtField.setBounds(0,0, 200, 30);
add(txtField);
setSize(200,255);
setVisible(true);
}
public static void main(String[] args)
{
new Calculator("Calculator");
}}
回答by bharat choudhary
custom calculator
自定义计算器
GUI is frame custom...
GUI是框架自定义...
public class Calculator implements ActionListener
{
final static Point point = new Point();
JFrame frame;
JButton one,two,three,four,five,six,seven,eight,nine,zone,cancel,clear,cancel1,sub,add,equal,dot,mult,div,adsub,baket,up;
JPanel top,top1,top2,down,down1,down2,history;
JLabel name,images;
//JTextField text1,text2;
ImageIcon up1,up2;
JTextPane text1;
JScrollPane pane;
ScriptEngine engine;
Border em;
boolean endwith1;
int numbcount=1,opercount=1,numbcount1=1;
boolean operaffer=true;
int lensold;
boolean baketsub=true;
boolean dotcheck=false;
boolean baketcheck=true;
int baketcount=0;
int baketcount1=1;
boolean check;
boolean check1;
SimpleAttributeSet attrib;
public Calculator()
{
frame = new JFrame();
engine = new ScriptEngineManager().getEngineByExtension("js");
name = new JLabel(" Calculator");
name.setForeground(Color.WHITE);
name.setFont(new FontUIResource("Franklin Gothic Medium", Font.PLAIN, 18));
one = new JButton("1");
one.addActionListener(this);
one.setFocusPainted(false);
one.setBackground(Color.WHITE);
one.setForeground(Color.BLACK);
one.setBorder(BorderFactory.createLineBorder(new Color(240, 240, 240),1));
one.setFont(new FontUIResource("OCR-B 10 BT", Font.PLAIN, 25));
two = new JButton("2");
two.addActionListener(this);
two.setFocusPainted(false);
two.setBackground(Color.WHITE);
two.setForeground(Color.BLACK);
two.setBorder(BorderFactory.createLineBorder(new Color(240, 240, 240),1));
two.setFont(new Font("OCR-B 10 BT", Font.PLAIN, 25));
three = new JButton("3");
three.addActionListener(this);
three.setFocusPainted(false);
three.setBackground(Color.WHITE);
three.setForeground(Color.BLACK);
three.setBorder(BorderFactory.createLineBorder(new Color(240, 240, 240),1));
three.setFont(new Font("OCR-B 10 BT", Font.PLAIN, 25));
four = new JButton("4");
four.addActionListener(this);
four.setFocusPainted(false);
four.setBackground(Color.WHITE);
four.setForeground(Color.BLACK);
four.setBorder(BorderFactory.createLineBorder(new Color(240, 240, 240),1));
four.setFont(new Font("OCR-B 10 BT", Font.PLAIN, 25));
five = new JButton("5");
five.addActionListener(this);
five.setFocusPainted(false);
five.setBackground(Color.WHITE);
five.setForeground(Color.BLACK);
five.setBorder(BorderFactory.createLineBorder(new Color(240, 240, 240),1));
five.setFont(new Font("OCR-B 10 BT", Font.PLAIN, 25));
six = new JButton("6");
six.addActionListener(this);
six.setFocusPainted(false);
six.setBackground(Color.WHITE);
six.setForeground(Color.BLACK);
six.setBorder(BorderFactory.createLineBorder(new Color(240, 240, 240),1));
six.setFont(new Font("OCR-B 10 BT", Font.PLAIN, 25));
seven = new JButton("7");
seven.addActionListener(this);
seven.setFocusPainted(false);
seven.setBackground(Color.WHITE);
seven.setForeground(Color.BLACK);
seven.setBorder(BorderFactory.createLineBorder(new Color(240, 240, 240),1));
seven.setFont(new Font("OCR-B 10 BT", Font.PLAIN, 25));
eight = new JButton("8");
eight.addActionListener(this);
eight.setFocusPainted(false);
eight.setBackground(Color.WHITE);
eight.setForeground(Color.BLACK);
eight.setBorder(BorderFactory.createLineBorder(new Color(240, 240, 240),1));
eight.setFont(new Font("OCR-B 10 BT", Font.PLAIN, 25));
nine = new JButton("9");
nine.addActionListener(this);
nine.setFocusPainted(false);
nine.setBackground(Color.WHITE);
nine.setForeground(Color.BLACK);
nine.setBorder(BorderFactory.createLineBorder(new Color(240, 240, 240),1));
nine.setFont(new Font("OCR-B 10 BT", Font.PLAIN, 25));
zone = new JButton("0");
zone.addActionListener(this);
zone.setFocusPainted(false);
zone.setBackground(Color.WHITE);
zone.setForeground(Color.BLACK);
zone.setBorder(BorderFactory.createLineBorder(new Color(240, 240, 240),1));
zone.setFont(new Font("OCR-B 10 BT", Font.PLAIN, 25));
cancel = new JButton("x");
cancel.addActionListener(this);
cancel.setFocusPainted(false);
cancel.setBackground(new Color(48, 174, 184));
cancel.setForeground(Color.WHITE);
cancel.setBorder(new EmptyBorder(6,6,6,6));
cancel.setFont(new Font("OCR-A BT", Font.PLAIN, 25));
cancel1 = new JButton("X");
cancel1.addActionListener(this);
cancel1.setFocusPainted(false);
cancel1.setBackground(new Color(250, 250, 250));
cancel1.setForeground(new Color(255, 0, 0));
cancel1.setBorder(BorderFactory.createLineBorder(new Color(240, 240, 240),1));
cancel1.setFont(new Font("OCR-A BT", Font.BOLD, 25));
clear = new JButton("C");
clear.addActionListener(this);
clear.setFocusPainted(false);
clear.setBackground(new Color(250, 250, 250));
clear.setForeground(new Color(49, 166, 216));
clear.setBorder(BorderFactory.createLineBorder(new Color(240, 240, 240),1));
clear.setFont(new Font("OCR-B 10 BT", Font.BOLD,35));
sub = new JButton("-");
sub.addActionListener(this);
sub.setFocusPainted(false);
sub.setBackground(new Color(250, 250, 250));
sub.setForeground(new Color(49, 166, 216));
sub.setBorder(BorderFactory.createLineBorder(new Color(240, 240, 240),1));
sub.setFont(new Font("OCR-B 10 BT", Font.PLAIN, 35));
add = new JButton("+");
add.addActionListener(this);
add.setFocusPainted(false);
add.setBackground(new Color(250, 250, 250));
add.setForeground(new Color(49, 166, 216));
add.setBorder(BorderFactory.createLineBorder(new Color(240, 240, 240),1));
add.setFont(new Font("OCR-B 10 BT", Font.PLAIN, 35));
mult = new JButton("*");
mult.addActionListener(this);
mult.setFocusPainted(false);
mult.setBackground(new Color(250, 250, 250));
mult.setForeground(new Color(49, 166, 216));
mult.setBorder(BorderFactory.createLineBorder(new Color(240, 240, 240),1));
mult.setFont(new Font("OCR-B 10 BT", Font.PLAIN, 35));
div = new JButton("/");
div.addActionListener(this);
div.setFocusPainted(false);
div.setBackground(new Color(250, 250, 250));
div.setForeground(new Color(49, 166, 216));
div.setBorder(BorderFactory.createLineBorder(new Color(240, 240, 240),1));
div.setFont(new Font("OCR-B 10 BT", Font.PLAIN, 30));
equal = new JButton("=");
equal.addActionListener(this);
equal.setFocusPainted(false);
equal.setBackground(new Color(250, 250, 250));
equal.setForeground(new Color(0, 153, 0));
equal.setBorder(BorderFactory.createLineBorder(new Color(240, 240, 240),1));
equal.setFont(new Font("OCR-B 10 BT", Font.BOLD, 35));
dot = new JButton(".");
dot.addActionListener(this);
dot.setFocusPainted(false);
dot.setBackground(Color.WHITE);
dot.setForeground(Color.BLACK);
dot.setBorder(BorderFactory.createLineBorder(new Color(240, 240, 240),1));
dot.setFont(new Font("OCR-B 10 BT", Font.PLAIN, 25));
adsub = new JButton("+/-");
adsub.addActionListener(this);
adsub.setFocusPainted(false);
adsub.setBackground(Color.WHITE);
adsub.setForeground(Color.BLACK);
adsub.setBorder(BorderFactory.createLineBorder(new Color(240, 240, 240),1));
adsub.setFont(new Font("OCR-B 10 BT", Font.PLAIN, 25));
baket = new JButton("()");
baket.addActionListener(this);
baket.setFocusPainted(false);
baket.setBackground(new Color(250, 250, 250));
baket.setForeground(new Color(49, 166, 216));
baket.setBorder(BorderFactory.createLineBorder(new Color(240, 240, 240),1));
baket.setFont(new Font("OCR-B 10 BT", Font.PLAIN, 25));
//text1 = new JTextField();
//text1.setColumns(10);
//text1.setFont(new Font("OCR-B 10 BT",Font.PLAIN, 35));
//text1.setBorder(new EmptyBorder(4, 7, 4, 7));
//text1.setHorizontalAlignment(SwingConstants.TRAILING);
//text1.setCaretColor(new Color(49, 166, 216));
attrib = new SimpleAttributeSet();
StyleConstants.setAlignment(attrib, StyleConstants.ALIGN_RIGHT);
StyleConstants.setFontSize(attrib, 30);
text1 = new JTextPane();
text1.setEditorKit(new WrapEditorKit());
text1.setParagraphAttributes(attrib, true);
text1.setBorder(new EmptyBorder(4, 7, 4, 7));
text1.setCaretColor(new Color(49, 166, 216));
text1.setPreferredSize(new Dimension(270, 130));
JScrollPane scrollpane = new JScrollPane(text1);
scrollpane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
scrollpane.getVerticalScrollBar().setPreferredSize(new Dimension(5, 5));
scrollpane.getVerticalScrollBar().setUI(new ScrollLookandFeel());
em = BorderFactory.createEmptyBorder(0, 0, 0, 0);
scrollpane.setBorder(em);
UIManager.put("ScrollBarUI", "My.package.ScrollLookandFeel");
//text2 = new JTextField();z
//text2.setFont(new Font("OCR-B 10 BT",Font.PLAIN, 35));
// text2.setBorder(new EmptyBorder(4, 7, 4, 7));
// text2.setHorizontalAlignment(SwingConstants.RIGHT);
// text2.setForeground(new Color(0, 153, 0));
// text2.setCaretColor(new Color(49, 166, 216));
up2 = new ImageIcon(CreateImage("/project/1467651440_calculator.png").getImage().getScaledInstance(20, 20, Image.SCALE_SMOOTH));
images = new JLabel(up2);
images.setBorder(BorderFactory.createLineBorder(new Color(48, 174, 184),4));
top = new JPanel();
top1 = new JPanel();
top1.setSize(200,400);
top1.setBackground(new Color(48, 174, 184));
top1.setLayout(new BorderLayout());
top1.add(images,BorderLayout.WEST);
top1.add(name,BorderLayout.CENTER);
top1.add(cancel,BorderLayout.EAST);
top2 = new JPanel();
top2.setLayout(new BorderLayout());
top2.add(scrollpane,BorderLayout.NORTH);
//top2.add(text2,BorderLayout.CENTER);
top.setLayout(new BorderLayout());
top.add(top1,BorderLayout.NORTH);
top.add(top2,BorderLayout.CENTER);
down = new JPanel();
down.setLayout(new BorderLayout());
up1 = new ImageIcon(CreateImage("/project/1467658414_arrow-down-01_1.png").getImage().getScaledInstance(15, 15, Image.SCALE_SMOOTH));
up = new JButton();
up.setIcon(up1);
up.setFocusPainted(false);
up.setBackground(new Color(240, 240, 240));
up.setForeground(Color.BLACK);
up.setBorder(BorderFactory.createLineBorder(new Color(187, 197, 201),0));
up.setFont(new Font("OCR-B 10 BT", Font.PLAIN, 15));
down1 = new JPanel();
down1.setLayout(new BorderLayout());
down1.add(up);
down2 = new JPanel();
down2.setBackground(new Color(240, 240, 240));
down2.setLayout(new GridLayout(5, 4));
down2.add(clear);
down2.add(div);
down2.add(mult);
down2.add(cancel1);
down2.add(seven);
down2.add(eight);
down2.add(nine);
down2.add(sub);
down2.add(four);
down2.add(five);
down2.add(six);
down2.add(add);
down2.add(one);
down2.add(two);
down2.add(three);
down2.add(baket);
down2.add(zone);
down2.add(dot);
down2.add(adsub);
down2.add(equal);
down.add(down1,BorderLayout.NORTH);
down.add(down2,BorderLayout.CENTER);
frame.add(top,BorderLayout.NORTH);
frame.add(down,BorderLayout.CENTER);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setSize(270,450);
frame.setUndecorated(true);
frame.setIconImage(CreateImage("/project/1467651440_calculator.png").getImage().getScaledInstance(60, 60, Image.SCALE_SMOOTH));
frame.addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e)
{
point.x = e.getX();
point.y = e.getY();
}
});
frame.addMouseMotionListener(new MouseMotionAdapter() {
@Override
public void mouseDragged(MouseEvent e)
{
Point p = frame.getLocation();
frame.setLocation(p.x+e.getX()-point.x,p.y+e.getY()-point.y);
}
});
frame.setVisible(true);
}
private ImageIcon CreateImage(String path)
{
return new ImageIcon(java.awt.Toolkit.getDefaultToolkit().getClass().getResource(path));
}
@Override
public void actionPerformed(ActionEvent e) {
switch(e.getActionCommand())
{
case "1":
numberAction("1");
break;
case "2":
numberAction("2");
break;
case "3":
numberAction("3");
break;
case "4":
numberAction("4");
break;
case "5":
numberAction("5");
break;
case "6":
numberAction("6");
break;
case "7":
numberAction("7");
break;
case "8":
numberAction("8");
break;
case "9":
numberAction("9");
break;
case "0":
numberAction("0");
break;
case ".":
dots(".");
break;
case "+":
digitalAction("+");
break;
case "-":
digitalAction("-");
break;
case "*":
digitalAction("*");
break;
case "/":
digitalAction("/");
break;
case "=":
total();
break;
case "C":
clear();
break;
case "X":
cancel1();
break;
case "()":
Baket();
break;
case "+/-":
baketsub();
break;
}
if(e.getSource()==cancel)
{
frame.setVisible(false);
frame.dispose();
}
}
private void clear()
{
numbcount=1;
opercount=1;
numbcount1=1;
baketcount=0;
baketcount1=1;
baketcheck=true;
baketsub=true;
operaffer=true;
text1.setText("");
}
private void digitalAction(String operation)
{
if(!text1.getText().equals(""))
{
String txt1 = text1.getText();
endwith1 = txt1.endsWith(operation);
System.out.println("text "+endwith1);
int len = txt1.length();
String subs = txt1.substring(len-1);
System.out.println(subs);
if(endwith1==true)
{
}else
{
if(!subs.equals("+") && !subs.equals("-") && !subs.equals("/") && !subs.equals("*"))
{
if(opercount<=5)
{
text1.setText(text1.getText()+operation);
opercount++;
}
String txt10 = text1.getText();
boolean add1 = txt10.endsWith("+");
boolean sub1 = txt10.endsWith("-");
boolean mult1 = txt10.endsWith("*");
boolean div1 = txt10.endsWith("/");
if(true==add1 ||true==sub1 ||true==mult1 || true==div1 )
{
operaffer=false;
numbcount1=1;
}
}else
{
String hide=text1.getText();
text1.setText("");
for(int J=0;J<hide.length()-1;J++)
{
text1.setText(text1.getText()+hide.charAt(J));
}
text1.setText(text1.getText()+operation);
}
}
}else
{
text1.setText("");
}
baketcheck=true;
}
private void numberAction(String buttonNumber)
{
if(true==operaffer)
{
String txt2 = text1.getText();
boolean endwith2 = txt2.endsWith(")");
if(true!=endwith2)
{
if(!text1.getText().equals("0"))
{
if(numbcount<=5)
{
text1.setText(text1.getText()+buttonNumber);
numbcount++;
}
dotcheck=true;
baketsub=false;
String txt3 = text1.getText();
lensold = txt3.length();
System.out.println("len"+lensold);
check = txt3.contains(".");
System.out.println(check);
}else
{
String hide=text1.getText();
text1.setText("");
for(int J=0;J<hide.length()-1;J++)
{
text1.setText(text1.getText()+hide.charAt(J));
}
text1.setText(text1.getText()+buttonNumber);
}
}
}else
{
String txt4 = text1.getText();
int len = txt4.length();
String ss = txt4.substring(len-2);
System.out.println("ss "+ss);
if(ss.equals("+0") || ss.equals("-0") || ss.equals("*0") || ss.equals("/0"))
{
String hide=text1.getText();
text1.setText("");
for(int J=0;J<hide.length()-1;J++)
{
text1.setText(text1.getText()+hide.charAt(J));
}
text1.setText(text1.getText()+buttonNumber);
}
else
{
String txt5 = text1.getText();
boolean endwith3 = txt5.endsWith(")");
if(true!=endwith3)
{
if(numbcount1<=5)
{
text1.setText(text1.getText()+buttonNumber);
numbcount1++;
}
dotcheck=true;
baketsub=false;
String txt6 = text1.getText();
int le = txt6.length();
int subt = le-numbcount1;
String subs1 = txt6.substring(subt);
System.out.println("tt"+subt);
System.out.println("tt"+subs1);
check1 = subs1.contains(".");
System.out.println("tt"+check1);
check=false;
}
}
}
baketcheck=false;
String txt = text1.getText();
int ff = txt.length();
System.out.print("ffss"+ff);
if(ff>=14)
{
StyleConstants.setFontSize(attrib, 25);
text1.setParagraphAttributes(attrib, true);
if(ff>=25)
{
StyleConstants.setFontSize(attrib, 20);
text1.setParagraphAttributes(attrib, true);
}
}
}
private void dots(String dot)
{
String txt7 = text1.getText();
boolean endwith4 = txt7.endsWith(dot);
if(true == dotcheck)
{
if(check==false && check1==false)
{
if(false==endwith4)
{
text1.setText(text1.getText()+dot);
}
}
}
}
public void total()
{
try
{
Object result = engine.eval(text1.getText());
if(result==null)
{
text1.setText("Wrong null");
}else
{
text1.setText("\n ="+result.toString());
}
}
catch(ScriptException es)
{
text1.setText("Wrong format");
}
}
private void cancel1() {
if(!text1.getText().equals(""))
{
String txt8 = text1.getText();
boolean endwith5 = txt8.endsWith("(");
if(true==endwith5)
{
String hide=text1.getText();
text1.setText("");
for(int J=0;J<hide.length()-1;J++)
{
text1.setText(text1.getText()+hide.charAt(J));
}
baketcount--;
baketcount1=1;
baketsub=true;
}else
{
String txt9 = text1.getText();
int length = txt9.length();
String subs2 = txt9.substring(length-1);
System.out.println(subs2);
if(subs2.equals("+") || subs2.equals("-") ||subs2.equals("/") || subs2.equals("-") )
{
String hide=text1.getText();
text1.setText("");
for(int J=0;J<hide.length()-1;J++)
{
text1.setText(text1.getText()+hide.charAt(J));
}
opercount--;
}else
{
if(length<=lensold)
{
String hide=text1.getText();
text1.setText("");
for(int J=0;J<hide.length()-1;J++)
{
text1.setText(text1.getText()+hide.charAt(J));
}
numbcount--;
operaffer=true;
baketsub=true;
baketcheck=true;
}else
{
String hide=text1.getText();
text1.setText("");
for(int J=0;J<hide.length()-1;J++)
{
text1.setText(text1.getText()+hide.charAt(J));
}
numbcount1--;
}
}
}
String txt = text1.getText();
int ff = txt.length();
System.out.print("ffss"+ff);
if(ff<=14)
{
StyleConstants.setFontSize(attrib, 30);
text1.setParagraphAttributes(attrib, true);
}
}
}
private void Baket()
{
if(baketcheck==true)
{
text1.setText(text1.getText()+"(");
baketcount++;
}else
{
if(baketcount1<=baketcount)
{
text1.setText(text1.getText()+")");
baketcount1++;
}else
{
text1.setText(text1.getText()+"*");
baketcheck=true;
operaffer=false;
numbcount1=1;
opercount++;
}
}
System.out.print(baketcount);
}
private void baketsub()
{
if(text1.getText().equals(""))
{
if(baketsub==true)
{
text1.setText(text1.getText()+"(-");
}
baketcheck=false;
baketcount++;
opercount++;
}
}
private static class ScrollLookandFeel extends BasicScrollBarUI {
private ScrollLookandFeel() {
}
@Override
protected void configureScrollBarColors() {
thumbColor = Color.LIGHT_GRAY;
thumbDarkShadowColor = Color.LIGHT_GRAY;
thumbHighlightColor = Color.LIGHT_GRAY;
thumbLightShadowColor = Color.lightGray;
trackColor = new Color(245, 245, 245);
trackHighlightColor = new Color(245, 245, 245);
}
@Override
protected JButton createDecreaseButton(int orientation) {
JButton button = new BasicArrowButton(orientation);
button.setBackground(new Color(245, 245, 245));
button.setForeground(new Color(245, 245, 245));
button.setBorder(new EmptyBorder(10, 10, 10, 10));
return button;
}
@Override
protected JButton createIncreaseButton(int orientation) {
JButton button = new BasicArrowButton(orientation);
button.setBackground(new Color(245, 245, 245));
button.setForeground(new Color(245, 245, 245));
button.setBorder(new EmptyBorder(10, 10, 10, 10));
return button;
}
}
class WrapEditorKit extends StyledEditorKit
{
final ViewFactory defaults = new WrapColumnFactory();
@Override
public ViewFactory getViewFactory()
{
return defaults;
}
}
class WrapColumnFactory implements ViewFactory
{
@Override
public View create(Element elem) {
String ki = elem.getName();
if(ki!=null)
{
switch (ki) {
case AbstractDocument.ContentElementName:
return new WrapLabelView(elem);
case AbstractDocument.ParagraphElementName:
return new ParagraphView(elem);
case AbstractDocument.SectionElementName:
return new BoxView(elem, View.Y_AXIS);
case StyleConstants.ComponentElementName:
return new ComponentView(elem);
case StyleConstants.IconElementName:
return new IconView(elem);
}
}
return new LabelView(elem);
}
}
class WrapLabelView extends LabelView
{
public WrapLabelView(Element elem)
{
super(elem);
}
@Override
public float getMinimumSpan(int axis)
{
switch (axis)
{
case View.X_AXIS:
return 0;
case View.Y_AXIS:
return super.getMinimumSpan(axis);
default:
throw new IllegalArgumentException("Invalid axis"+axis);
}
}
}
public static void main(String []args)
{
Calculator c = new Calculator();
}
}
回答by Kumar Vivek Mitra
If you are from Visual Basic you will be into habits of drag and drop, then why leave it when you can do it in Java too.
如果您来自 Visual Basic，您将养成拖放的习惯，那么当您也可以在 Java 中完成时，为什么要放弃它。
Use WindowsBuilder Pro, now free from Google...and use the Group Layoutto design ur application present in it. Group Layout was developed by NetBeans team back in 2005.
使用WindowsBuilder Pro，现在可以从 Google 中免费使用...并使用Group Layout来设计您的应用程序。组布局是由 NetBeans 团队于 2005 年开发的。
