计算器设计java版的源代码

这是用java编写的计算器的源代码,界面粗糙,在elipse中运行通过,就两个类:第一个类frame ,代码如下 package jisuanqi; import java.awt.Color; import java.awt.Container; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Point; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JTextField; public class frame { static double aa=0;//寄存器 static int bb=0;//判断是否为连续输入运算符 static int cc=0; static char dd='d';//记录前一次运算符的值 public static void main(String args[]){ JFrame fm=new JFrame("计算器"); fm.setSize(220,180); //fm.setMaximumSize(null); fm.setLocation(new Point(200,100)); fm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container container=fm.getContentPane(); GridBagLayout layout=new GridBagLayout(); container.setLayout(layout); GridBagConstraints gg=new GridBagConstraints(); JTextField txt=new JTextField("0"); txt.setHorizontalAlignment(JTextField.RIGHT); txt.setEditable(false); txt.setBackground(Color.white); gg.gridx=0; gg.gridy=0; gg.fill=GridBagConstraints.HORIZONTAL; gg.gridheight=1; gg.gridwidth=15; container.add(txt,gg); gg.fill=GridBagConstraints.NONE; gg.gridy=1; gg.gridwidth=2; JButton btn7=new JButton("7"); Mylistener mylistener7 =new Mylistener(btn7.getText(),txt); btn7.addActionListener(mylistener7); container.add(btn7,gg); JButton btn8=new JButton("8"); Mylistener mylistener8 =new Mylistener(btn8.getText(),txt); btn8.addActionListener(mylistener8); gg.gridx=2; container.add(btn8,gg); JButton btn9=new JButton("9"); Mylistener mylistener9 =new Mylistener(btn9.getText(),txt); btn9.addActionListener(mylistener9); gg.gridx=4; container.add(btn9,gg); JButton btnc=new JButton("/"); gg.gridx=6; container.add(btnc,gg); Mylistener mylistenerc =new Mylistener(btnc.getText(),txt); btnc.addActionListener(mylistenerc); JButton btnb=new JButton("B"); gg.gridx=8; container.add(btnb,gg); Mylistener mylistenerb =new Mylistener(btnb.getText(),txt); btnb.addActionListener(mylistenerb); gg.gridx=0; gg.gridy=2; JButton btn4=new JButton("4"); Mylistener mylistener4 =new Mylistener(btn4.getText(),txt); btn4.addActionListener(mylistener4); container.add(btn4,gg); JButton btn5=new JButton("5"); gg.gridx=2; Mylistener mylistener5 =new Mylistener(btn5.getText(),txt); btn5.addActionListener(mylistener5); container.add(btn5,gg); JButton btn6=new JButton("6"); gg.gridx=4; Mylistener mylistener6 =new Mylistener(btn6.getText(),txt); btn6.addActionListener(mylistener6); container.add(btn6,gg); JButton btncf=new JButton("*"); gg.gridx=6; Mylistener mylistenercf =new Mylistener(btncf.getText(),txt); btncf.addActionListener(mylistenercf); container.add(btncf,gg); gg.gridx=8; Mylistener mylistenerce =new Mylistener(btnce.getText(),txt); btnce.addActionListener(mylistenerce); container.add(btnce,gg); gg.gridx=0; gg.gridy=3; JButton btn1=new JButton("1"); container.add(btn1,gg); Mylistener mylistener1 =new Mylistener(btn1.getText(),txt); btn1.addActionListener(mylistener1); JButton btn2=new JButton("2"); gg.gridx=2; Mylistener mylistener2 =new Mylistener(btn2.getText(),txt); btn2.addActionListener(mylistener2); container.add(btn2,gg); JButton btn3=new JButton("3"); gg.gridx=4; Mylistener mylistener3 =new Mylistener(btn3.getText(),txt); btn3.addActionListener(mylistener3); container.add(btn3,gg); JButton btnjf=new JButton("-"); gg.gridx=6; Mylistener mylistenerjf =new Mylistener(btnjf.getText(),txt); btnjf.addActionListener(mylistenerjf); container.add(btnjf,gg); JButton btncc=new JButton("C"); gg.gridx=8; Mylistener mylistenercc =new Mylistener(btncc.getText(),txt); btncc.addActionListener(mylistenercc); container.add(btncc,gg); gg.gridx=0; gg.gridy=4; JButton btn0=new JButton("0"); container.add(btn0,gg); Mylistener mylistenero =new Mylistener(btn0.getText(),txt); btn0.addActionListener(mylistenero); JButton btnqf=new JButton("+/-"); gg.gridx=2; Mylistener mylistenerqf =new Mylistener(btnqf.getText(),txt); btnqf.addActionListener(mylistenerqf); container.add(btnqf,gg); gg.gridx=4; Mylistener mylistenerd =new Mylistener(btnd.getText(),txt); btnd.addActionListener(mylistenerd); container.add(btnd,gg); JButton btnjiaf=new JButton("+"); gg.gridx=6; Mylistener mylistenerfff =new Mylistener(btnjiaf.getText(),txt); btnjiaf.addActionListener(mylistenerfff); container.add(btnjiaf,gg); JButton btndy=new JButton("="); gg.gridx=8; container.add(btndy,gg); Mylistener mylistenerdy =new Mylistener(btndy.getText(),txt); btndy.addActionListener(mylistenerdy); fm.setVisible(true); } } 第二个类Mylistener 代码如下: package jisuanqi; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JTextField; public class Mylistener implements ActionListener { private String a;//button上的值 private JTextField txt;//txt的引用 Mylistener(String aa,JTextField txt){//构造方法 this.a=aa; this.txt=txt; } void init(){ frame.aa=0;//寄存器 frame.bb=0;//判断是否为连续输入运算符 frame.cc=0; frame.dd='d';//记录前一次运算符的值 this.txt.setText("0"); } public void actionPerformed(ActionEvent e){ System.out.println(a); if(a=="0"| a=="1"| a=="2" | a=="3"| a=="4"| a=="5"| a=="6"| a=="7" | a=="8" | a=="9" | a=="."){ if(frame.bb!=0){this.txt.setText("0");frame.bb=0;} System.out.println("数字"+"b"+frame.bb); if(this.txt.getText().length()==1){ //当前文本框里的字符串的长度为一 if(a=="."){//当前输入为小数点 this.txt.setText(this.txt.getText()+"."); }else{//当前输入不为小数点 if(this.txt.getText()=="0" & this.a=="0"){ this.txt.setText("0"); }else if(this.txt.getText().charAt(0)=='0'& this.a!="0"){ this.txt.setText(a); }else if(this.txt.getText().charAt(0) != '0'){ this.txt.setText(this.txt.getText()+a); } } } else{//当前文本框里的字符串的长度不为一 if(a=="."){//当前输入是. 就查找txt的值中有不有 . if(this.txt.getText().indexOf('.')== -1){//没出现. this.txt.setText(this.txt.getText()+a); }else { //原字符串不变 } }else{ this.txt.setText(this.txt.getText()+a); } } } //************************************************** if(a=="+" | a=="-" | a=="*" | a=="/" ){ frame.bb++; if(this.txt.getText().charAt(this.txt.getText().length()-1)=='.'){//处理以.结尾的字符串 this.txt.setText(this.txt.getText().substring(0,this.txt.getText().length ()-1)); }//如果字符串以.结尾就把字符串的最后以为抹去 if(frame.cc==0){//第一次输入运算符 frame.aa=Double.valueOf(this.txt.getText()).doubleValue(); frame.cc=1; frame.dd=this.a.charAt(0);//记录前一次输入运算符的值 }else{//在这里面进行四则运算 //加法运算 if(frame.dd=="+".charAt(0)){ frame.aa+=Double.valueOf(this.txt.getText()).doubleValue(); this.txt.setText(String.valueOf(frame.aa).toString()); frame.dd=this.a.charAt(0); }else if(frame.dd=="-".charAt(0)){ frame.aa-=Double.valueOf(this.txt.getText()).doubleValue(); this.txt.setText(String.valueOf(frame.aa).toString()); frame.dd=this.a.charAt(0); }else if(frame.dd=="*".charAt(0)){ frame.aa*=Double.valueOf(this.txt.getText()).doubleValue(); this.txt.setText(String.valueOf(frame.aa).toString()); frame.dd=this.a.charAt(0); }else if(frame.dd=="/".charAt(0)){ if(this.txt.getText().charAt(0)=="0".charAt(0)){//除零是不允许的 System.out.println("被除数不能为零"); this.init(); }else{ double ff=Double.valueOf(this.txt.getText()).doubleValue(); frame.aa=frame.aa/ff; this.txt.setText(String.valueOf(frame.aa).toString()); frame.dd=this.a.charAt(0);} } } } if(a=="B"){ if(this.txt.getText().length()==1 ){ this.txt.setText("0"); } if(this.txt.getText().length()!=1 & this.txt.getText().charAt(0)!='0'){ this.txt.setText(this.txt.getText().substring(0,this.txt.getText().length ()-1)); } } if(a=="+/-"){ if(this.txt.getText().charAt(0)!='-'){ this.txt.setText("-"+this.txt.getText()); }else{ this.txt.setText(this.txt.getText().substring(1)); } } if(a=="E"){ this.init(); } if(a=="C"){ this.txt.setText("0"); } if(a=="="){ if(frame.cc!=0){ if(frame.dd=="+".charAt(0)){ frame.aa+=Double.valueOf(this.txt.getText()).doubleValue(); this.txt.setText(String.valueOf(frame.aa).toString()); //frame.dd=this.a.charAt(0); }else if(frame.dd=="-".charAt(0)){ frame.aa-=Double.valueOf(this.txt.getText()).doubleValue(); this.txt.setText(String.valueOf(frame.aa).toString()); //frame.dd=this.a.charAt(0); }else if(frame.dd=="*".charAt(0)){ frame.aa*=Double.valueOf(this.txt.getText()).doubleValue(); this.txt.setText(String.valueOf(frame.aa).toString()); //frame.dd=this.a.charAt(0); }else if(frame.dd=="/".charAt(0)){ if(this.txt.getText().charAt(0)=="0".charAt(0)){//除零是不允许的 System.out.println("被除数不能为零"); this.init(); }else{ double ff=Double.valueOf(this.txt.getText()).doubleValue(); frame.aa=frame.aa/ff; this.txt.setText(String.valueOf(frame.aa).toString()); //frame.dd=this.a.charAt(0); } } frame.aa=0;//寄存器 frame.bb=1;//判断是否为连续输入运算符 frame.cc=0; frame.dd='d'; } } } }