java 语法错误，在java中插入“EnumBody”和“enum Identifier”
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Syntax error, insert "EnumBody" and "enum Identifier" in java
提问by Angela
im cant figure out what is wrong with my code if someone can help , why is it telling me this ? it gives me an error in toString method... why does it give me to insert enum body and identifier ? thank you
如果有人可以提供帮助，我无法弄清楚我的代码有什么问题，为什么要告诉我这个？它在 toString 方法中给了我一个错误......为什么它让我插入枚举体和标识符？谢谢
import java.lang.String;
public class Circle extends Shape {
private double radius;
public Circle( double theRadius ){
super();
if ( theRadius <= 0.0 )
setRadius( Shape.DEFAULT_SIZE );
else
setRadius( theRadius );
}
public double getSurfaceArea(){
return this.radius * this.radius * Math.PI;
}
public double getPeremeter(){
;
return 2 * this.radius + Math.PI;
}
public double getRadius(){
return this.radius;
}
public void setRadius( double theRadius ) {
if( theRadius <= 0 )
return;
this.radius = theRadius;
}
@Override
public double getPerimeter() {
// TODO Auto-generated method stub
return 0;
public String toString() {
return "Circle Surface Area "+getSurfaceArea()+", Circle Peremeter " +getPerimeter();
}
}
@Override
public double getSizeAmount() {
// TODO Auto-generated method stub
return 0;
}
}
main class
主班
import javax.swing.JOptionPane;
import java.text.DecimalFormat;
public class ShapeApp {
public static <RectangularPrism> void main(String[] args) {
int x = 0;
Triangle triangleObjects[] = new Triangle[ 3 ];
triangleObjects[ 0 ] = new Rectangle("3.5","4.6");
triangleObjects[ 1 ] = new Rectangle("3","2");
triangleObjects[ 2 ] = new Circle(0);
System.out.println( "List of all Shapes:\n" );
do{
try{
for( Triangle currentTriangle : triangleObjects ) {
String msg = currentTriangle.getSurfaceArea() +","+ currentTriangle.getPerimeter();
JOptionPane.showMessageDialog(null, "Message", msg, JOptionPane.INFORMATION_MESSAGE);
x=2;
}
}catch(Exception e) {
}
}while(x==1);
}
}
error
错误
Exception in thread "main" java.lang.Error: Unresolved compilation problems:
Syntax error on token "String", @ expected
Syntax error, insert "enum Identifier" to complete EnumHeaderName
Syntax error, insert "EnumBody" to complete BlockStatement
at Circle.getPerimeter(Circle.java:44)
at ShapeApp.main(ShapeApp.java:80)
回答by Jon Skeet
Look at your getPerimetermethod:
看看你的getPerimeter方法：
@Override
public double getPerimeter() {
// TODO Auto-generated method stub
return 0;
public String toString() {
return "Circle Surface Area "+getSurfaceArea()+", Circle Peremeter "
+getPerimeter();
}
}
You're trying to declare the toStringmethod withinthe getPerimetermethod.
你想申报toString方法中的getPerimeter方法。
The indentation of the code should have given you a hint about that - it's one reason why it's important to indent code appropriately. You should have:
代码的缩进应该给你一个提示——这是适当缩进代码很重要的一个原因。你应该有：
@Override
public double getPerimeter() {
// TODO Auto-generated method stub
return 0;
}
@Override
public String toString() {
return "Circle Surface Area " + getSurfaceArea() + ", Circle Perimeter "
+ getPerimeter();
}
回答by Michael Laffargue
@Override
public double getPerimeter() {
// TODO Auto-generated method stub
return 0;
public String toString() {
return "Circle Surface Area "+getSurfaceArea()+", Circle Peremeter " +getPerimeter();
}
}
should be separated in two :
应该分为两部分：
@Override
public double getPerimeter() {
// TODO Auto-generated method stub
return 0;
}
@Override
public String toString() {
return "Circle Surface Area "+getSurfaceArea()+", Circle Peremeter " +getPerimeter();
}
