Question

Java中LocationUtil是什么呢,这段代码是什么意思呢

import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.lang.reflect.Method;
import javax.swing.JFrame;
public class LocationUtil {
JFrame fram;
private int xx, yy;
private boolean isDraging = false;

public LocationUtil(JFrame frame) {
this.fram = frame;
fram.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
isDraging = true;
xx = e.getX();
yy = e.getY();
System.out.println("========="+xx+":"+yy);
}
public void mouseReleased(MouseEvent e) {
isDraging = false;
}
});
fram.addMouseMotionListener(new MouseMotionAdapter() {
public void mouseDragged(MouseEvent e) {
if (isDraging) {
int left =fram.getLocation().x;
int top = fram.getLocation().y;
fram.setLocation(left + e.getX() - xx, top + e.getY() - yy);
}
}
});
}
public void setOp(){
try {
Class clazz = Class.forName("com.sun.awt.AWTUtilities");
Method method = clazz.getMethod("setWindowOpaque",
java.awt.Window.class, Boolean.TYPE);
method.invoke(clazz, fram, false);
} catch (Exception e) {
e.printStackTrace();
}
}
}

Answer 1

isDraging
使用一个属性作为开关，（自己想想没有开关控制会怎么样）
fram.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
isDraging = true;
xx = e.getX();
yy = e.getY();
System.out.println("========="+xx+":"+yy);
}这段代码就是，添加一个鼠标监听器，当鼠标按下的时候，获取光标的坐标，

public void mouseReleased(MouseEvent e) {
isDraging = false;
}在鼠标移开的时候，将isDraging职位false(开关关闭)，

fram.addMouseMotionListener(new MouseMotionAdapter() {
public void mouseDragged(MouseEvent e) {
if (isDraging) {
int left =fram.getLocation().x;
int top = fram.getLocation().y;
fram.setLocation(left + e.getX() - xx, top + e.getY() - yy);

这段代码说的是鼠标拖拽的时候，光标的坐标变化
首先获取原始的光标的坐标，然后加上拖拽的横纵坐标，得到最后的坐标

public void setOp(){
try {
Class clazz = Class.forName("com.sun.awt.AWTUtilities");
Method method = clazz.getMethod("setWindowOpaque",
java.awt.Window.class, Boolean.TYPE);
method.invoke(clazz, fram, false);
} catch (Exception e) {
e.p }这段代码是使用动态代理的方法得到com.sun.awt.AWTUtilities 对象，方法，并调用

Answer 2

获取鼠标的坐标位置

追问

可以详细翻译下代码的意思吗？这个是自定义类吗