GridBagLayout布局管理器的应用_JAVA_编程开发_程序员俱乐部

    GridBagLayout布局管理器比较复杂，参数也比较多，参数的名字是
newGridBagConstraints(gridx,gridy,gridwidth,gridheight,weightx,weighty,anchor,
fill,insert,ipadx,ipady);每个参数均是按这样的顺序排列，关于参数的详细介绍以后再写，下面的例子用布局管理器实现了基本的功能

import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.Toolkit;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextArea;

@SuppressWarnings("serial")
public class Teste3 extends JFrame{
	private static JTextArea jTextArea;
	private JButton jButton1;
	private JButton jButton2;
	private JButton jButton3;
	
    public Teste3(){   	
    	GridBagLayout gridbag = new GridBagLayout();
		this.setLayout(gridbag);
		gridbag.setConstraints(getJtextArea(), new GridBagConstraints(0,0,3,2,1.0,1.0,GridBagConstraints.CENTER,GridBagConstraints.BOTH,new Insets(100,100,30,100),0,0));
		gridbag.setConstraints(getJButton1(), new GridBagConstraints(0,2,1,1,1.0,0.0,GridBagConstraints.SOUTH,GridBagConstraints.HORIZONTAL,new Insets(30,200,100,100),0,0));
		gridbag.setConstraints(getJButton2(), new GridBagConstraints(1,2,1,1,1.0,0.0,GridBagConstraints.SOUTH,GridBagConstraints.HORIZONTAL,new Insets(30,100,100,100),0,0));
		gridbag.setConstraints(getJButton3(), new GridBagConstraints(2,2,1,1,1.0,0.0,GridBagConstraints.SOUTH,GridBagConstraints.HORIZONTAL,new Insets(30,100,100,200),0,0));
		this.add(getJtextArea());
		this.add(getJButton1());
		this.add(getJButton2());
		this.add(getJButton3());
		Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();	   
 	    int screenWidth = (int) screenSize.getWidth(); //获得屏幕的宽
 	    int screenHight = (int) screenSize.getHeight();//获得屏幕的高
 	    this.setSize(screenWidth, screenHight);
		this.setVisible(true);
    }
    
    private JTextArea getJtextArea(){
    	if(jTextArea == null){
    		jTextArea = new JTextArea();  		
    	}
    	return jTextArea;
    }
    
    private JButton getJButton1(){
    	if(jButton1 == null){
    		jButton1 = new JButton("jButton1");
    	}
    	return jButton1;
    }
    
    private JButton getJButton2(){
    	if(jButton2 == null){
    		jButton2 = new JButton("jButton2");
    	}
    	return jButton2;
    }
    
    private JButton getJButton3(){
    	if(jButton3 == null){
    		jButton3 = new JButton("jButton3");
    	}
    	return jButton3;
    }
       
    public static void main(String args[]){
    	new Teste3();
    }
}
  

    上面的代码运行之后，窗口变化时页面大小也会跟着变化，jTextArea窗口没有加入滚动条，加入这两行代码后:
    JScrollPane scroll = new JScrollPane(getJTextArea());
    this.add(scroll);
    jTextArea将变得不可见，正在调试中，也欢迎高手指教。