简单加减乘除计算器

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1、importjava.awt.FlowLayout;importjava.awt.GridLayout;importjava.awt.event.ActionEvent;importjava.awt.event.ActionListener;importjavax.swing.JButton;importjavax.swing.JComboBox;importjavax.swing.JFrame;importjavax.swing.JLabel;importjavax.swing.JOptionPane;impo

2、rtjavax.swing.JPanel;importjavax.swing.JTextField;importjava.util.*;publicclassSuperCalculatorextendsJFrameimplementsActionListener{privateJLabelheading;privateJPanelheaderPanel;privateJTextFieldnumber1=null;privateJComboBoxop=null;privateJTextFieldnumber2=nu

3、ll;privateJButtoneq=null;privateJButtonclear=null;privateJButtona1=null;privateJButtona2=null;privateJButtona3=null;privateJButtona4=null;privateJTextFieldresult=null;publicSuperCalculator(){this.setLayout(newFlowLayout(FlowLayout.CENTER));this.add(heading=ne

4、wJLabel(""));this.add(heading=newJLabel("SUPERCALCULATOR"));this.add(heading=newJLabel(""));this.add(heading=newJLabel(""));this.add(heading=newJLabel(""));//this.setLayout(null)；//this.add(heading=newJLabel(""));this.add(heading=newJLabel("Numner1"));number1

5、=newJTextField(5);op=newJComboBox(newString[]{"+","-","×","÷"});number2=newJTextField(5);eq=newJButton("Exit");eq.addActionListener(this);a1=newJButton("Add");a1.addActionListener(this);a2=newJButton("Subtract");a2.addActionListener(this);a3=newJButton("Multi

6、ple");a3.addActionListener(this);a4=newJButton("Divide");a4.addActionListener(this);clear=newJButton("Clear");clear.addActionListener(this);result=newJTextField(5);this.add(number1);this.add(heading=newJLabel("Numner2"));this.add(number2);this.add(heading=new

7、JLabel("Result"));this.add(result);//this.result.disable();this.add(heading=newJLabel(""));this.add(heading=newJLabel(""));this.add(a1);this.add(a2);this.add(a3);this.add(a4);this.add(heading=newJLabel(""));this.add(clear);this.add(eq);this.setDefaultCloseOpe

8、ration(JFrame.EXIT_ON_CLOSE);this.setSize(480,280);this.setLocationRelativeTo(null);this.setTitle("SuperCalculator");this.setResizable(false);this.setVisible(true);}publicstaticvoidmain(S