安卓开发计算器小程序的功能,java实现计算器小数运算

Java多功能计算器小程序（附界面）早期写的计算器，现在看来还是挺粗糙的，各个控件应该用数组来初始化和排版，懒得改凑合看吧。功能挺全的，求根加减乘除百分制删除清空，和实体简易计算器几乎一致 package calculator;import java.awt.*import javax.swing.*public class mldxh extends JFrame implements ActionListener{private JTextField text_show;private JButton button_sqrt,button_hxdzc,button_CE,button_C, button背后的热狗,button_8,button_9,button_divide, button_4,button_5,button_6,button_multiply, button_1,button_2,button_3,button_minus, button_0,button_dot,button_equal,button_plus;private JPanel jpanel; private char sign;private double v1;private double v2;private boolean reop;public mldxh(){this.setTitle("计算器");this.setBounds(700,400,300,324);this.setBackground(Color.lightGray);this.setFont(new Font("Arial",Font.BOLD,18));JFrame f=new JFrame();f.setLayout(new BorderLayout());text_show=new JTextField("",100);jpanel=new JPanel();Container container=getContentPane();container.add(text_show, BorderLayout.NORTH);container.add(jpanel, BorderLayout.CENTER);text_show.setEditable(false);text_show.setHorizontalAlignment(JTextField.RIGHT);jpanel.setLayout(new GridLayout(5,4));button_sqrt=new JButton("sqrt");button_hxdzc=new JButton("%");button_CE=new JButton("CE");button_C=new JButton("C"); button背后的热狗=new JButton("7");button_8=new JButton("8"); button_9=new JButton("9");button_divide=new JButton("/"); button_4=new JButton("4");button_5=new JButton("5"); button_6=new JButton("6");button_multiply=new JButton("*"); button_1=new JButton("1");button_2=new JButton("2"); button_3=new JButton("3");button_minus=new JButton("-"); button_0=new JButton("0");button_dot=new JButton("."); button_equal=new JButton("=");button_plus=new JButton("+"); button_sqrt.addActionListener(this); button_hxdzc.addActionListener(this); button_CE.addActionListener(this); button_C.addActionListener(this); button背后的热狗.addActionListener(this); button_8.addActionListener(this); button_9.addActionListener(this); button_divide.addActionListener(this); button_4.addActionListener(this); button_5.addActionListener(this); button_6.addActionListener(this); button_multiply.addActionListener(this); button_1.addActionListener(this); button_2.addActionListener(this); button_3.addActionListener(this); button_minus.addActionListener(this); button_0.addActionListener(this); button_dot.addActionListener(this); button_equal.addActionListener(this); button_plus.addActionListener(this);jpanel.add(button_sqrt);jpanel.add(button_hxdzc);jpanel.add(button_CE);jpanel.add(button_C);jpanel.add(button背后的热狗);jpanel.add(button_8);jpanel.add(button_9);jpanel.add(button_divide);jpanel.add(button_4);jpanel.add(button_5);jpanel.add(button_6);jpanel.add(button_multiply);jpanel.add(button_1);jpanel.add(button_2);jpanel.add(button_3);jpanel.add(button_minus);jpanel.add(button_0);jpanel.add(button_dot);jpanel.add(button_equal);jpanel.add(button_plus);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setVisible(true);}public void actionPerformed(ActionEvent ev){double value=0; char operator=0; if(reop) { text_show.setText(""); reop = false; }if(ev.getSource()==button_0){String str=text_show.getText();if(str.equals(""))return;text_show.setText(str+'0');}if(ev.getSource()==button_1){String str=text_show.getText();text_show.setText(str+'1');}if(ev.getSource()==button_2){String str=text_show.getText();text_show.setText(str+'2');}if(ev.getSource()==button_3){String str=text_show.getText();text_show.setText(str+'3');}if(ev.getSource()==button_4){String str=text_show.getText();text_show.setText(str+'4');}if(ev.getSource()==button_5){String str=text_show.getText();text_show.setText(str+'5');}if(ev.getSource()==button_6){String str=text_show.getText();text_show.setText(str+'6');}if(ev.getSource()==button背后的热狗){String str=text_show.getText();text_show.setText(str+'7');}if(ev.getSource()==button_8){String str=text_show.getText();text_show.setText(str+'8');}if(ev.getSource()==button_9){String str=text_show.getText();text_show.setText(str+'9');}if(ev.getSource()==button_dot){String str=text_show.getText();text_show.setText(str+'.');}if(ev.getSource()==button_C){text_show.setText("");return;}if(ev.getSource()==button_plus){operator='+';}if(ev.getSource()==button_minus){operator='-';}if(ev.getSource()==button_multiply){operator='*';}if(ev.getSource()==button_divide){operator='/';}if(ev.getSource()==button_equal){operator='=';}if(ev.getSource()==button_hxdzc){operator='%';}if(ev.getSource()==button_sqrt){operator='^';}if(ev.getSource()==button_CE){operator='e';}switch(operator){case'e' : String s=text_show.getText(); text_show.setText(s.substring(0,s.length()-1)); break;case'^' : v1=Double.parseDouble(text_show.getText()); value=Math.sqrt(v1);text_show.setText(String.valueOf(value));reop = true; break;case'%' : v1=Double.parseDouble(text_show.getText()); value=v1/100;text_show.setText(String.valueOf(value));reop = true; break;case'+' : v1=Double.parseDouble(text_show.getText()); text_show.setText("");sign='+';break;case'-' : v1=Double.parseDouble(text_show.getText()); text_show.setText("");sign='-';break;case'*' : v1=Double.parseDouble(text_show.getText()); text_show.setText("");sign='*';break; case'/' : v1=Double.parseDouble(text_show.getText()); text_show.setText("");sign='/';break; case'=' : reop = true; v2=Double.parseDouble(text_show.getText()); switch(sign){ case'+' : value=v1+v2;break; case'-' : value=v1-v2;break; case'*' : value=v1*v2;break; case'/' : value=v1/v2;break; default:value=v1; } String str=String.valueOf(value); text_show.setText(str); break; default:; }}public static void main(Stringdpdjm args) {// TODO Auto-generated method stubnew mldxh();}}版权声明：本文为博主原创文章，博客地址：http://blog.csdn.net/qq_37808895，未经博主允许不得转载。程序结果图如下