java的布局方式非常常用，以下介绍5种常用的布局方式。 1.FlowLayout（流式布局） import java.awt.Container; import java.awt.FlowLayout; import javax.swing.JButton; import javax.swing.JFrame; /**
将组件已加入顺序从左到右排序，一行排满就会去第二行。每行组件剧中排列
*/ public class FlowLayoutDemo {
private JFrame frame;
private JButton button1,button2,button3,button4,button5;
public static void main(String[] args) {
FlowLayoutDemo fd = new FlowLayoutDemo();
fd.go();
}
private void go() {
frame = new JFrame("flowlayout");
Container contentPane = frame.getContentPane();
contentPane.setLayout(new FlowLayout());
button1 = new JButton("OK");
button2 = new JButton("OPEN");
button3 = new JButton("CLOSE");
button4 = new JButton("aaa");
button5 = new JButton("CLOSEccc");
contentPane.add(button1);
contentPane.add(button2);
contentPane.add(button3);
contentPane.add(button4);
contentPane.add(button5);
frame.setSize(300,200);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}12345678910111213141516171819202122232425262728293031323334353637383940运行结果如下
2.BorderLayout（边界布局） import java.awt.BorderLayout; import javax.swing.JButton; import javax.swing.JFrame;
/**
由BorderLayout管理的容器被划分为5个区域North south west east center
*/ public class BorderLayoutDemo { private JFrame frame; private JButton be,bw,bn,bs,bc;
public static void main(String[] args) {
BorderLayoutDemo bd = new BorderLayoutDemo();
bd.go();
}
private void go() {
frame = new JFrame("BorderLayoutDemo");
be = new JButton("east");
bw = new JButton("west");
bn = new JButton("north");
bs = new JButton("south");
bc = new JButton("center");
frame.getContentPane().add(be,BorderLayout.EAST);
frame.getContentPane().add(bw,BorderLayout.WEST);
frame.getContentPane().add(bn,BorderLayout.NORTH);
frame.getContentPane().add(bs,BorderLayout.SOUTH);
frame.getContentPane().add(bc,BorderLayout.CENTER);
frame.setSize(300, 200);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
} 12345678910111213141516171819202122232425262728293031323334353637383940运行结果如下
3.GridLayout（网格布局） import java.awt.Container; import java.awt.Dimension; import java.awt.GridLayout;
import javax.swing.JButton; import javax.swing.JFrame;
/**
将容器分为若干行和列，组件依次放入其中每个组件占据一格。
*/ public class GridLayoutDemo { public static void main(String[] args) { MyWindow that = new MyWindow(); that.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } }
@SuppressWarnings(“serial”) class MyWindow extends JFrame { private JButton b1,b2,b3,b4,b5,b6; public MyWindow() { setTitle(“grid”); Container contentPane = getContentPane(); contentPane.setPreferredSize(new Dimension(400,300)); contentPane.setLayout(new GridLayout(3,2));//3行2列 b1 =new JButton(“b1”); b2 =new JButton(“b2”); b3 =new JButton(“b3”); b4 =new JButton(“b4”); b5 =new JButton(“b5”); b6 =new JButton(“b6”); contentPane.add(b1); contentPane.add(b2); contentPane.add(b3); contentPane.add(b4); contentPane.add(b5); contentPane.add(b6); pack(); setVisible(true); } }1234567891011121314151617181920212223242526272829303132333435363738394041424344运行结果如下
4.BoxLayout（盒式布局） import java.awt.BorderLayout; import java.awt.Container; import java.awt.FlowLayout; import java.awt.Label;
import javax.swing.BoxLayout; import javax.swing.JFrame; import javax.swing.JPanel;
/**
将容器中的组件水平或者竖直排成一行或一列
*/ public class BoxLayoutDemo {
private JFrame jFrame;
private JPanel jPanel,jPanel2;
public static void main(String[] args) {
BoxLayoutDemo boxLayoutDemo = new BoxLayoutDemo();
boxLayoutDemo.go();
}
private void go () {
jFrame = new JFrame("box lay");
Container contentPane = jFrame.getContentPane();
jPanel = new JPanel();
jPanel.setLayout(new BoxLayout(jPanel, BoxLayout.Y_AXIS));
jPanel.add(new Label("1"));
jPanel.add(new Label("2"));
jPanel.add(new Label("3"));
contentPane.add(jPanel, BoxLayout.X_AXIS);
jPanel2 = new JPanel();
jPanel2.setLayout(new BoxLayout(jPanel2, BoxLayout.X_AXIS));
jPanel2.add(new Label("yes"));
jPanel2.add(new Label("no"));
jPanel2.add(new Label("cancel"));
//contentPane.add(jPanel2,BorderLayout.SOUTH);
//contentPane.add(jPanel2,FlowLayout.CENTER);
jFrame.pack();
jFrame.setVisible(true);
jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
} 123456789101112131415161718192021222324252627282930313233343536373839404142434445运行结果如下
5.CradLayout（卡片布局） import java.awt.BorderLayout; import java.awt.CardLayout; import java.awt.Container; import java.awt.event.ActionEvent; import java.awt.event.ActionListener;
import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel;
/**
卡片布局 每时每刻只显示一张
*/ @SuppressWarnings(“serial”) public class CardlayoutDemo extends JFrame {
public static void main(String[] args) {
new CardlayoutDemo();
}
public CardlayoutDemo() {
this.setTitle("Cardlayout");
this.setSize(400, 400);
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container c = this.getContentPane();
JButton jbtn1 = new JButton("上一个");
c.add(jbtn1, BorderLayout.NORTH);
final JPanel mainJPanel = new JPanel();
//匿名内部类只能访问final变量
final CardLayout cardLayout = new CardLayout();
mainJPanel.setLayout(cardLayout);
mainJPanel.add(new JLabel("第1张"), "one");
mainJPanel.add(new JLabel("第2张"), "two");
mainJPanel.add(new JLabel("第3张"), "three");
mainJPanel.add(new JLabel("第4张"), "four");
c.add(mainJPanel, BorderLayout.CENTER);
JButton jbtn2 = new JButton("下一个");
c.add(jbtn2, BorderLayout.SOUTH);
jbtn1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cardLayout.previous(mainJPanel);
}
});
jbtn2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cardLayout.next(mainJPanel);
}
});
//cardLayout.show(mainJPanel, "three");
this.setVisible(true);
}
} 运行结果如下