java 带有 JRadioButton r[]=new JRadioButton[3] 的 setSelected() 不起作用
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setSelected() with JRadioButton r[]=new JRadioButton[3] not working
提问by Salil Dua
Here I made a dummy Programme....
在这里我做了一个虚拟程序......
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class MyClass1 implements ActionListener
{
JFrame fr;
JRadioButton opt[]=new JRadioButton[2];
JButton btnext;
JRadioButton r1;
MyClass1()
{
fr=new JFrame();
fr.setLayout(null);
opt[0]=new JRadioButton("Hello");
opt[1]=new JRadioButton("Welcome");
r1=new JRadioButton("Jealsous");
btnext=new JButton();
ButtonGroup bg=new ButtonGroup();
bg.add(opt[0]);
bg.add(opt[1]);
opt[0].setBounds(50,100,200,30);
r1.setBounds(50,200,200,30);
opt[1].setBounds(50,150,200,30);
btnext.setBounds(400,350,100,30);
fr.add(opt[1]);
fr.add(opt[0]);
fr.add(btnext);
fr.add(r1);
btnext.addActionListener(this);
fr.setSize(800,500);
fr.setVisible(true);
}
public void actionPerformed(ActionEvent e)
{
System.out.println(opt[0].getText());
opt[0].setSelected(false); //not working
r1.setSelected(false); //working
}
public static void main(String[] s)
{
new MyClass1();
}
}
In this code when I am clicking on button the radiobutton which is an array opt[0] is still selected. Whereas radiobutton r1 is not selected . So basically when I am calling the function setSelected with array of objects it is doing nothing, when me calling with distinct object it is working fine. In the big programme I need of array of objects so that I can use it in for loop and get it initialized to some value coming out of String 2Dimensional Array.
在这段代码中，当我单击按钮时，仍然选择了数组 opt[0] 的单选按钮。而单选按钮 r1 未被选中。所以基本上当我用对象数组调用函数 setSelected 时它什么都不做，当我用不同的对象调用它时它工作正常。在大程序中，我需要对象数组，以便我可以在 for 循环中使用它并将其初始化为来自 String 2Dimensional Array 的某个值。
回答by Ashish
You can do buttonGroup.clearSelection().
你可以做到buttonGroup.clearSelection()。
but this method is available in java 1.6+ only.
但此方法仅在 java 1.6+ 中可用。
http://java.sun.com/javase/6/docs/api/javax/swing/ButtonGroup.html#clearSelection()
http://java.sun.com/javase/6/docs/api/javax/swing/ButtonGroup.html#clearSelection()
@Override
public void actionPerformed(ActionEvent e)
{
System.out.println(opt[0].getText());
bg.clearSelection();
r1.setSelected(false); //working
}
