java-计算器实验报告.doc

计算器实验报告一、 实验目的1.熟悉java图形用户界面的设计原理和程序结构2.能设计复核问题要求的图形用户界面程序3.熟悉java awt和swing的组合4.掌握常用组建的事件借口5.会应用awt和swing组件进行应用程序设计二、 实验内容运用所学的java语言，实现计算器的基础功能，及科学计算器的一些功能。三、 实验设计主要成员变量及属性成员变量描述变量类型名称运算按纽JButtonbutton功能按纽JMenuBarbarJButton组件表示了两类按钮，第一类按钮是数字按钮，包括0-9等10个按钮。第二类按钮式功能式按钮，例如+、-、*、/、%等按钮。JMenuBar按钮设置了工具条菜单栏，这次总共设置了两个菜单。这两种按钮需要注册监听，需要实现public void actionPerformed(ActionEvent e)函数，通过e.getSource()可以识别注册监听的按钮，并进行相应的操作。计算器界面如下所示：菜单栏代码如下：jmb=new JMenuBar();jm1=new JMenu(选项(V);/助记符，Alt+vjm1.setMnemonic(v);jm2=new JMenu(关于(A);jm2.setMnemonic(a);jmi1=new JMenuItem(标准);/注册监听jmi1.addActionListener(this);jmi1.setActionCommand(标准);jmi2=new JMenuItem(科学);jmi2.addActionListener(this);jmi2.setActionCommand(科学);jmi3=new JMenuItem(关于计算器);jmi3.addActionListener(this);jmi3.setActionCommand(about);窗体设置的代码：this.setIconImage(new ImageIcon(images/计算器图片.jpg).getImage();this.setTitle(计算器);this.setBounds(500, 180,300,300);this.setVisible(true);this.setDefaultCloseOperation(EXIT_ON_CLOSE);this.setResizable(false);时间监听处理函数代码：/通常在按钮被按下，或双击一个列表项或选中某个菜单时发生Overridepublic void actionPerformed(ActionEvent e) / TODO Auto-generated method stubif(e.getSource()=jb18)/等于double result=0;num2=Double.parseDouble(jtf.getText();switch(ch)case +:result=num1+num2;break;case -:result=num1-num2;break;case *:result=num1*num2;break;case /:if(num2!=0)result=num1/num2;elsejtf.setText(0);break;case %:if(num2!=0)result=num1%num2;elsejtf.setText(0);break;case e:result=num1*Math.pow(10, num2);break;if(num2!=0)if(result=(int)(result)jtf.setText(int)(result)+);elsejtf.setText(result+);isdecnum=false;四、实验总结：通过对计算器窗体的编写我熟悉java图形用户界面的设计原理和程序结构熟悉java awt和swing的组合。学会将书本上的知识运用在实际中，提升了编程能力。五代码：package com.java;import java.io.*;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.*;public class Calculator_1 extends JFrame implements ActionListener/* * param args */JTextField jtf=null; /文本框JButton jb=null;/按钮JPanel jp1=null;JPanel jp2=null;JMenuBar jmb=null; /菜单条JMenu jm1=null,jm2=null; /菜单项JMenuItem jmi1=null,jmi2=null,jmi3=null; /菜单子选项boolean isdecnum=false; /判断目前是否为小数char ch; /获得运算符号double num1=0,num2=0;public static void main(String args) / TODO Auto-generated method stubCalculator_1 cal=new Calculator_1();public Calculator_1()jmb=new JMenuBar();jm1=new JMenu(选项(V);/助记符，Alt+vjm1.setMnemonic(v);jm2=new JMenu(关于(A);jm2.setMnemonic(a);jmi1=new JMenuItem(标准);/注册监听jmi1.addActionListener(this);jmi1.setActionCommand(标准);jmi2=new JMenuItem(科学);jmi2.addActionListener(this);jmi2.setActionCommand(科学);jmi3=new JMenuItem(关于计算器);jmi3.addActionListener(this);jmi3.setActionCommand(about);jm1.add(jmi1);jm1.add(jmi2);jm2.add(jmi3);this.setJMenuBar(jmb);jmb.add(jm1);jmb.add(jm2);jtf=new JTextField(0,20);jtf.setHorizontalAlignment(JTextField.RIGHT);jtf.setEditable(false);this.add(jtf,North);jb=new JButton32;jp1=new JPanel();jp1.setLayout(new GridLayout(5,4,5,5);/jp1中的按钮jb0=new JButton(C);jb1=new JButton(-);jb2=new JButton(+/-);jb3=new JButton(sqrt);jb4=new JButton(7);jb5=new JButton(8);jb6=new JButton(9);jb7=new JButton(/);jb8=new JButton(4);jb9=new JButton(5);jb10=new JButton(6);jb11=new JButton(*);jb12=new JButton(1);jb13=new JButton(2);jb14=new JButton(3);jb15=new JButton(-);jb16=new JButton(0);jb17=new JButton(.);jb18=new JButton(=);jb19=new JButton(+);/添加到jp1中for(int i=0;i=19;i+)jp1.add(jbi,i);jbi.addActionListener(this);this.add(jp1);jp2=new JPanel();jp2.setLayout(new GridLayout(3,4,5,5);/jp2中的按钮jb20=new JButton(sin);jb21=new JButton(cos);jb22=new JButton(tan);jb23=new JButton();jb24=new JButton(pow);jb25=new JButton(x);jb26=new JButton();jb27=new JButton(ln);jb28=new JButton(Int);jb29=new JButton(n!);jb30=new JButton(%);jb31=new JButton(1/x);for(int i=20;ijb.length;i+)jp2.add(jbi,i-20);jbi.addActionListener(this);this.setIconImage(new ImageIcon(images/计算器图片.jpg).getImage();this.setTitle(计算器);this.setBounds(500, 180,300,300);this.setVisible(true);this.setDefaultCloseOperation(EXIT_ON_CLOSE);this.setResizable(false);public void Num(int num)if(jtf.getColumns()=20)String s_num=jtf.getText();if(s_num.equals(0)s_num=num+;jtf.setText(s_num);elses_num+=num;jtf.setText(s_num);/通常在按钮被按下，或双击一个列表项或选中某个菜单时发生Overridepublic void actionPerformed(ActionEvent e) / TODO Auto-generated method stubif(e.getSource()=jb4)Num(7);else if(e.getSource()=jb5)Num(8);else if(e.getSource()=jb6)Num(9);else if(e.getSource()=jb7)/除法num1=Double.parseDouble(jtf.getText();ch=/;isdecnum=false;jtf.setText(0);else if(e.getSource()=jb8)Num(4);else if(e.getSource()=jb9)Num(5);else if(e.getSource()=jb10)Num(6);else if(e.getSource()=jb11)/乘法num1=Double.parseDouble(jtf.getText();ch=*;isdecnum=false;jtf.setText(0);else if(e.getSource()=jb12)Num(1);else if(e.getSource()=jb13)Num(2);else if(e.getSource()=jb14)Num(3);else if(e.getSource()=jb15)/减法num1=Double.parseDouble(jtf.getText();ch=-;isdecnum=false;jtf.setText(0);else if(e.getSource()=jb16)Num(0);else if(e.getSource()=jb17)/小数点if(!isdecnum)if(jtf.getColumns()=20)String s_num=jtf.getText();s_num+=.;jtf.setText(s_num);isdecnum=true;else if(e.getSource()=jb18)/等于double result=0;num2=Double.parseDouble(jtf.getText();switch(ch)case +:result=num1+num2;break;case -:result=num1-num2;break;case *:result=num1*num2;break;case /:if(num2!=0)result=num1/num2;elsejtf.setText(0);break;case %:if(num2!=0)result=num1%num2;elsejtf.setText(0);break;case e:result=num1*Math.pow(10, num2);break;if(num2!=0)if(result=(int)(result)jtf.setText(int)(result)+);elsejtf.setText(result+);isdecnum=false;else if(e.getSource()=jb19)/加法num1=Double.parseDouble(jtf.getText();ch=+;isdecnum=false;jtf.setText(0);else if(e.getSource()=jb0)/Cjtf.setText(0);num1=0;num2=0;else if(e.getSource()=jb1)/1)s_num=s_num.substring(0,s_num.length()-1);jtf.setText(s_num);elsejtf.setText(0);else if(e.getSource()=jb2)/+/-double d_num=Double.parseDouble(jtf.getText();if(d_num!=0)d_num=0-d_num;if(d_num=(int)(d_num)jtf.setText(int)(d_num)+);elsejtf.setText(d_num+);elsejtf.setText(0);else if(e.getSource()=jb3)/sqrtdouble d_num=Double.parseDouble(jtf.getText();if(d_num=0)d_num=Math.sqrt(d_num);if(d_num=(int)(d_num)jtf.setText(int)(d_num)+);elsejtf.setText(d_num+);else if(e.getSource()=jb20)/sindouble d_num=Double.parseDouble(jtf.getText();if(d_num=0)d_num=Math.sin(d_num);if(d_num=(int)(d_num)jtf.setText(int)(d_num)+);elsejtf.setText(d_num+);else if(e.getSource()=jb21)/cosdouble d_num=Double.parseDouble(jtf.getText();if(d_num=0)d_num=Math.cos(d_num);if(d_num=(int)(d_num)jtf.setText(int)(d_num)+);elsejtf.setText(d_num+);else if(e.getSource()=jb22)/tandouble d_num=Double.parseDouble(jtf.getText();if(d_num=0)d_num=Math.tan(d_num);if(d_num=(int)(d_num)jtf.setText(int)(d_num)+);elsejtf.setText(d_num+);else if(e.getSource()=jb23)/jtf.setText(Math.PI+);else if(e.getSource()=jb24)/pownum1=Double.parseDouble(jtf.getText();ch=e;isdecnum=false;jtf.setText(0);else if(e.getSource()=jb25)/平方double d_num=Double.parseDouble(jtf.getText();d_num*=d_num;if(d_num=(int)(d_num)jtf.setText(int)(d_num)+);elsejtf.setText(d_num+);else if(e.getSource()=jb26)/logdouble d_num=Double.parseDouble(jtf.getText();d_num=Math.log10(d_num);if(d_num=(int)(d_num)jtf.setText(int)(d_num)+);elsejtf.setText(d_num+);else if(e.getSource()=jb27)/lndouble d_num=Double.parseDouble(jtf.getText();d_num=Math.log1p(d_num);if(d_num=(int)(d_num)jtf.setText(int)(d_num)+);elsejtf.setText(d_num+);else if(e.getSource()=jb28)/IntString s_num=jtf.getText();String ss_num=new String2;ss_num=s_num.split(.);jtf.setText(ss_num0+);else if(e.getSource()=jb29)/n!double d_num=Double.parseDouble(jtf.getText();if(d_num=(int)(d_num)int i=1;int i_num=1;while(i=(int)(d_num)i_num*=i;i+;jtf.setText(i_num+);else if(e.getSource()=jb30)/%num1=Double.parseDouble(jtf.getText();ch=%;isdecnum=false;jtf.setText(0);else if(e.getSource()=jb31)/1/xif(jtf.getText()!=0)double d_num=Double.parseDouble(jtf.getText();d_num=1/d_num;if(d_num