我有一个动画类,它只绘制两个圆和一条线(没有主方法),在另一个类中我有一个主方法,它作为一个对象传递给动画类,应该显示我绘制的两个圆,但它没有t 显示,它只显示窗口,没有我做过的圆圈或线条,如果我要将 main 方法放在我的动画类中,它将完美地工作,这是一个用户错误,但我不确定是什么或者为什么。
单独类中的动画方法。
import javax.swing.*;
import java.awt.geom.*;
import java.awt.*;
import java.awt.Graphics.*;
import javax.swing.JApplet;
public class Animation extends JApplet{
public void init(){
}
public static void createAndShowGUI(JApplet j)
{
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
frame.setSize(500,500);
frame.getContentPane().add("Center", j);
}
public void paint(Graphics g){
Graphics2D g2 = (Graphics2D) g;
int x=50;
int y=10;
g2.setPaint(Color.black);
g2.draw(new Line2D.Double(x,y,50,400));
drawT(g2);
drawH(g2);
//create a method that translates
}
public void drawH(Graphics2D g2)
{
int y=25;
g2.setColor(Color.blue);
drawCircle(y,g2);
}
public void drawT(Graphics2D g2){
int y=100;
g2.setColor(Color.green);
drawCircle(y,g2);
}/*
public void raceLoop(){
long startingTime = System.currentTimeMillis();
long cumTime=startingTime;
while(mve.hposition<70){
long timePassed = System.currentTimeMillis()-cumTime;
cumTime += timePassed;
//mve.update(timePassed);
}
}*/
public void drawCircle(int y, Graphics2D g2)
{
g2.fillOval(50,y,50,50);
}
}
主要方法
import javax.swing.*;
import java.awt.geom.*;
import java.awt.*;
import java.awt.Graphics.*;
import javax.swing.JApplet;
public class Race {
public static void main(String[] args) {
JApplet applet = new JApplet();
Animation animie = new Animation();
animie.createAndShowGUI(applet);
}
}