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這裏是代碼,希望有人可以提供幫助。根據我所瞭解的一切,這應該是一個藍色的Jframe,但它不是。我有一點點小事,所以要溫柔。也忽略了的東西,在垃圾郵件,除非有什麼關係我的jframe是空白的,沒有顏色
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.JFrame;
public class HelloWorld extends JFrame{
private long beforeTime, afterTime, diff = 0;
public HelloWorld() {
//spam();
setTitle("Computer Quest");
setSize(640,480);
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBackground(Color.BLUE);
setVisible(true);
}
public void spam() {
for (int i = 1; i<= 10; i++) {
beforeTime = System.nanoTime();
log("Welcome to computer quest");
afterTime =System.nanoTime();
diff = afterTime - beforeTime;
log("Time taken"+ diff);
}
}
public static void main (String[] args) {
new HelloWorld();
}
private void log(String s) {
System.out.println(s);
}
}
getContentPane.setBackground(Color.BLUE); – mKorbel
嘗試'getContentPane()。setBackground(Color.BLUE);' – Sybren
@mrKorbel getContentPane需要'()'。 – Sybren