小编use*_*574的帖子

有没有办法计算(例如)120%的50%？我试过了:

int k = (int)(120 / 100)*50;

但它不起作用.

我试图制作更改其他按钮文本的按钮,但是settext不起作用.

这是appdroid.java:

包appdroid;

public class appdroid{

    static int a = 640;
    static int b = 400;
    static int c = 100;
    static int d = 100;

    public static void main(String[] args) {
        new gui();
    }
}

这是gui.java:

package appdroid;
import javax.swing.AbstractButton;
import javax.swing.JFrame;
import javax.swing.JButton;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class gui extends JFrame implements ActionListener {

    String[] a = {"Search device","Device not found","Error, bad device","Device found"};
    String[] b = {"Device not found","Error, bad device","Compile"};
    String[] c = …

当我添加一个抛出异常来运行或初始化时,我有一个错误,上面写着:

ray.java:115: error run() in xray cannot implement run() in Runnable

public void run() throws Exception(

          ^ 

overriden method does not throw Exception 

1 error

我需要尝试{..} catch来获取URL工作.try {...} catch需要抛出异常的作品.