可以计算加减乘除的计算器小程序package zj lec1; import java awt BorderLayout; import java awt FlowLayout; import java awt GridLayout; import java awt event ActionEvent; import java awt event ActionListener; import java math BigInteger; import javax swing JButton; import javax swing JFrame; import javax swing JLabel; import javax swing JPanel; import javax swing JTextField; public class 简易计算机 extends JFrame implements ActionListener { JTextField a b c d; JButton ok exit; public 简易计算机 { this setLayout new FlowLayout ; this add a new JTextField 10 ; a setText "0" ; a setHorizontalAlignment JTextField RIGHT ; this add b new JTextField 1 ; this add c new JTextField 10 ; c setText "0" ; c setHorizontalAlignment JTextField RIGHT ; this add ok new JButton " " ; this add d new JTextField 10 ; this add exit new JButton "Exit" ; a addActionListener this ; b addActionListener this ; c addActionListener this ; exit addActionListener this ; ok addActionListener this ; this setSize 540 70 ; this setTitle "简易计算机" ; this setVisible true ; this setResizable false ; } public static void main String[] args { new 简易计算机 ; } @Override public void actionPerformed ActionEvent e { if e getSource ok || e getSource c || e getSource a { BigInteger ia new BigInteger a getText ; BigInteger ic new BigInteger c getText ; String ib b getText ; 判断是用加法 还是减法 还是乘法 除法 if ib contains "+" { BigInteger id ia add ic ; d setText id toString ; } else if ib contains " " { BigInteger id ia subtract ic ; d setText id toString ; } else if ib contains " " { BigInteger id ia multiply ic ; d setText id toString ; } else if ib contains " " { BigInteger id ia divide ic ; d setText id toString ; } } else if e getSource exit { System exit 0 ; } } }">可以计算加减乘除的计算器小程序package zj lec1; import java awt BorderLayout; import java awt FlowLayout; import java awt GridLayout; import java awt event ActionEvent; import java awt event ActionListener; import java math BigInteger; import javax swing JButton; import javax swing J [更多] a new JTextField 10 ; a setText "0" ; a setHorizontalAlignment JTextField RIGHT ; this add b new JTextField 1 ; this add c new JTextField 10 ; c setText "0" ; c setHorizontalAlignment JTextField RIGHT ; this add ok new JButton " " ; this add d new JTextField 10 ; this add exit new JButton "Exit" ; a addActionListener this ; b addActionListener this ; c addActionListener this ; exit addActionListener this ; ok addActionListener this ; this setSize 540 70 ; this setTitle "简易计算机" ; this setVisible true ; this setResizable false ; } public static void main String[] args { new 简易计算机 ; } @Override public void actionPerformed ActionEvent e { if e getSource ok || e getSource c || e getSource a { BigInteger ia new BigInteger a getText ; BigInteger ic new BigInteger c getText ; String ib b getText ; 判断是用加法 还是减法 还是乘法 除法 if ib contains "+" { BigInteger id ia add ic ; d setText id toString ; } else if ib contains " " { BigInteger id ia subtract ic ; d setText id toString ; } else if ib contains " " { BigInteger id ia multiply ic ; d setText id toString ; } else if ib contains " " { BigInteger id ia divide ic ; d setText id toString ; } } else if e getSource exit { System exit 0 ; } } }">可以计算加减乘除的计算器小程序package zj lec1; import java awt BorderLayout; import java awt FlowLayout; import java awt GridLayout; import java awt event ActionEvent; import java awt event ActionListener; import java math BigInteger; import javax swing JButton; import javax swing J [更多]