写了个Frame却什么也显示不出来，这是为什么？
- Java code
import java.awt.BorderLayout;import java.awt.Container;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;public class Computor { public static void main(String[] args) { new ComputorFrame(); }}class ComputorFrame extends JFrame{ JLabel jl1,jl2,jl3,jl4,jl5,jl6; public ComputorFrame(){ super("计算器"); Container container=getContentPane(); jl1=new JLabel("被乘数"); jl2=new JLabel("乘数"); jl3=new JLabel("积"); JPanel p1=new JPanel(); p1.setLayout(null); p1.add(jl1); p1.add(jl2); p1.add(jl3); jl1.setSize(50, 40); jl1.setLocation(50, 0); jl2.setSize(50, 40); jl2.setLocation(100, 0); jl3.setSize(50, 40); jl3.setLocation(150, 0); jl4=new JLabel("被除数"); jl5=new JLabel("除数"); jl6=new JLabel("商"); JPanel p2=new JPanel(); p2.setLayout(null); p2.add(jl4); p2.add(jl5); p2.add(jl6); jl4.setSize(50, 40); jl4.setLocation(50, 50); jl5.setSize(50, 40); jl5.setLocation(100, 50); jl6.setSize(50, 40); jl6.setLocation(150, 50); container.add(p1,BorderLayout.NORTH); container.add(p2,BorderLayout.SOUTH); setSize(300,300); setVisible(true); }}------解决方案--------------------
LS正解，不明白LZ为什么要取消p1和p2的布局？？？。。。。
------解决方案--------------------
要是这样的话，就可以不用任何布局管理器(setLayout(null))；而对所有组件逐个进行setBounds()。
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jl1.setSize(50, 40);
jl1.setLocation(50, 0);
jl2.setSize(50, 40);
jl2.setLocation(100, 0);
jl3.setSize(50, 40);
jl3.setLocation(150, 0);
你的这些坐标定位希望是相对于什么的
如果是相对于container的
- Java code
import java.awt.BorderLayout;import java.awt.Container;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;public class Computor { public static void main(String[] args) { new ComputorFrame(); }}class ComputorFrame extends JFrame{ JLabel jl1,jl2,jl3,jl4,jl5,jl6; public ComputorFrame(){ super("计算器"); Container container=getContentPane(); container.setLayout(null); jl1=new JLabel("被乘数"); jl2=new JLabel("乘数"); jl3=new JLabel("积"); container.add(jl1); container.add(jl2); container.add(jl3); jl1.setSize(50, 40); jl1.setLocation(50, 0); jl2.setSize(50, 40); jl2.setLocation(100, 0); jl3.setSize(50, 40); jl3.setLocation(150, 0); jl4=new JLabel("被除数"); jl5=new JLabel("除数"); jl6=new JLabel("商"); container.add(jl4); container.add(jl5); container.add(jl6); jl4.setSize(50, 40); jl4.setLocation(50, 50); jl5.setSize(50, 40); jl5.setLocation(100, 50); jl6.setSize(50, 40); jl6.setLocation(150, 50); setSize(300,300); setVisible(true); }}