Java之GUI布局之计算器案列.doc

Java之GUI布局之计算机案列我们要做一个简单计算器的布局如图一、首先你要有一个JFramepackage org.zy.view;import java.awt.BorderLayout;import java.awt.Color;import java.awt.Dimension;import java.awt.FlowLayout;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JMenu;import javax.swing.JMenuBar;import javax.swing.JMenuItem;import javax.swing.JPanel;import javax.swing.JTextArea;import javax.swing.JTextField;public class Myframe extends JFrameprivate JFrame frame;Panelup up = new Panelup();Paneldown down = new Paneldown();public Myframe()frame = new JFrame(Caculator);new Jmenubar();frame.setLayout(new BorderLayout();frame.add(up,BorderLayout.NORTH);frame.add(down,BorderLayout.CENTER);frame.setJMenuBar(new Jmenubar();frame.setSize(350, 385);frame.setLocationRelativeTo(null );frame.setVisible(true);frame.setResizable(false);frame.setDefaultCloseOperation(EXIT_ON_CLOSE);二、其次，还要有JMenubarpackage org.zy.view;import javax.swing.JMenu;import javax.swing.JMenuBar;import javax.swing.JMenuItem;public class Jmenubar extends JMenuBarpublic Jmenubar() JMenu menu1 = new JMenu(查看(V);JMenu menu2 = new JMenu(编辑(E);JMenu menu3 = new JMenu(帮助(H);JMenuItem menuitem1 = new JMenuItem(标准型);JMenuItem menuitem2 = new JMenuItem(科学性);JMenuItem menuitem3 = new JMenuItem(程序员);JMenuItem menuitem4 = new JMenuItem(复制);JMenuItem menuitem5 = new JMenuItem(历史记录);JMenuItem menuitem6 = new JMenuItem(查看帮助);JMenuItem menuitem7 = new JMenuItem(关于计算器);menu1.add(menuitem1);menu1.add(menuitem2);menu1.add(menuitem3);menu2.add(menuitem4);menu2.add(menuitem5);menu3.add(menuitem6);menu3.add(menuitem7);this.add(menu1);this.add(menu2);this.add(menu3);三、下面是一个北边（输入框）布局的panelpackage org.zy.view;import java.awt.Color;import java.awt.Font;import javax.swing.JPanel;import javax.swing.JTextArea;import javax.swing.JTextField;public class Panelup extends JPanelprivate JTextField input;private JPanel panelup;public Panelup() input = new JTextField(19);input.setBackground(Color.pink);JTextArea area = new JTextArea();input.setFont(new Font(, Font.BOLD, 30);input.setText(0.);input.setHorizontalAlignment(JTextField.RIGHT);this.add(input);四、南边（各个按键）布局的panelpackage org.zy.view;import java.awt.Dimension;import java.awt.FlowLayout;import javax.swing.JButton;import javax.swing.JPanel;public class Paneldown extends JPanelpublic JPanel panel;public Paneldown() JButton btn = new JButton 28;for(int i =0; ibtn.length; i+)btni = new JButton();/先new出来，才能赋值panel = new JPanel(new FlowLayout(FlowLayout.LEFT,10,10);/*String bLabel = new String28; * bLabel0 = ; * * for(int i=0; i28; i+) * btni = new JButton(bLabeli); * panel.add(btni); * */btn0= new JButton(MC);btn1= new JButton(MR);btn2= new JButton(MS);btn3= new JButton(M+);btn4= new JButton(M-);btn5= new JButton(-);btn6= new JButton(CE);btn7= new JButton(C);btn8= new JButton(+-);btn9= new JButton();btn10= new JButton(7);btn11= new JButton(8);btn12= new JButton(9);btn13= new JButton(/);btn14= new JButton(%);btn15= new JButton(4);btn16= new JButton(5);btn17= new JButton(6);btn18= new JButton(*);btn19= new JButton(1/x);btn20= new JButton(1);btn21= new JButton(2);btn22= new JButton(3);btn23= new JButton(-);btn24= new JButton(+);btn25= new JButton(.);btn26= new JButton(0);btn27= new JButton(=);for (int i = 0; i btn.length; i+) this.add(btni);for (int i = 0; i btn.length; i+) btni.setPreferredSize(new Dimension(60,40);/赋值后才能改变sizebtn26.setPreferredSize(new Dimension(125,40);btn27.setPreferredSize(new Dim