指点一下，运行结果提示：Exception in thread "main" java.lang.NoSuchMethodError: main

[ricky_zh]

请高手指点一下，这个程序那里出错了，运行结果提示：Exception in thread "main" java.lang.NoSuchMethodError: main

public class Rectangle {
public int x, y;
private int m, n;
public Rectangle(){
x=10;
y=20;
m=100;
n=50;
System.out.println("x=" +x);
System.out.println("y=" +y);
}

public void measure(){
int s;
s=m*n;
System.out.println("result=" +s);
}
void show(){
System.out.println("x" +x + "y" +y);
}

}
class Shape extends Rectangle{
public static void main (String[] args){
int width =30, height=20;
Shape r = new Shape();
r.x=width;
r.y=height;
r.measure();
}
}

[dazhanhongtao]

将public class Rectangle该为class Rectangle
将class Shape extends Rectangle改为public class Shape extnds Rectangle

[brightyq]

main方法写到public的类里面。
像你这种写法，就把Shape单独写到一个文件中去吧，然后换成是
public class Shape extends Rectangle{
}
往下都一样。

[jlu_lamp_lamp]

意思就是你的public class的类没有main方法