一个漂亮的java计算器(实验报告)
这是一个用java实现的计算器,本来没想发上来的,隔了数年,今天偶尔又看到了这个计算器的实验报告,所以就上传上来了,希望能对有这个需求的小伙伴提供帮助吧!这里就直接将实验报告的关键代码演示内容帖上来了,注释就不加了
界面如下
新建java项目复制下面内容就行了
- 实验内容
程序：
package com.yunzhi.GUI;
import java.awt.Cursor;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Calculatordemo extends JFrame implements WindowListener,ActionListener {
String str;
String valuas;
String s;
double result;
String labe;
JMenuBar menubar;
JMenu menu1;
JMenu menu2;
JMenu menu3;
JMenuItem menuitem1;
JMenuItem menuitem2;
JMenuItem menuitem3;
JMenuItem menuitem4;
JMenuItem menuitem5;
JPanel panel;
JButton button;
JTextField text;
JLabel label;
GridBagConstraints contains;
public Calculatordemo()
{
labe="";
result=0;
str="";
valuas="0";
s="+";
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setSize(300,400);
this.setTitle("计算器");
this.setLayout(new FlowLayout());
menubar=new JMenuBar();
this.setJMenuBar(menubar);
menu1=new JMenu("查看(V)");
menu2=new JMenu("编辑(E)");
menu3=new JMenu("帮助(H)");
menuitem1=new JMenuItem("历史记录");
menuitem2=new JMenuItem("科学计算器");
menuitem3=new JMenuItem("标准计算器");
menuitem4=new JMenuItem("作者信息");
menuitem5=new JMenuItem("说明");
menuitem1.addActionListener(this);
menuitem2.addActionListener(this);
menuitem3.addActionListener(this);
menuitem4.addActionListener(this);
menuitem5.addActionListener(this);
menu1.add(menuitem1);
menu2.add(menuitem2);
menu2.add(menuitem3);
menu3.add(menuitem5);
menu3.add(menuitem4);
menubar.add(menu1);
menubar.add(menu2);
menubar.add(menu3);
panel=new JPanel();
panel.setLayout(new GridBagLayout());
contains=new GridBagConstraints();
text=new JTextField();
//text.setText("0");
text.setHorizontalAlignment(JTextField.RIGHT);
contains.gridx=0;
contains.gridy=0;
contains.gridwidth=5;
contains.gridheight=2;
contains.fill=GridBagConstraints.HORIZONTAL;
panel.add(text,contains);
createButton("x²", 0, 2, 1, 1,GridBagConstraints.HORIZONTAL, 5, 0);
createButton("√", 1, 2, 1, 1,GridBagConstraints.HORIZONTAL, 5, 5);
createButton("%", 2, 2, 1, 1,GridBagConstraints.HORIZONTAL, 5, 5);
createButton("删除", 3, 2, 2, 1,GridBagConstraints.HORIZONTAL, 5, 5);
createButton("7", 0, 3, 1, 1,GridBagConstraints.HORIZONTAL, 5, 0);
createButton("8", 1, 3, 1, 1,GridBagConstraints.HORIZONTAL, 5, 5);
createButton("9", 2, 3, 1, 1,GridBagConstraints.HORIZONTAL, 5, 5);
createButton("清零", 3, 3, 2, 1,GridBagConstraints.HORIZONTAL, 5, 5);
createButton("4", 0, 4, 1, 1,GridBagConstraints.HORIZONTAL, 5, 0);
createButton("5", 1, 4, 1, 1,GridBagConstraints.HORIZONTAL, 5, 5);
createButton("6", 2, 4, 1, 1,GridBagConstraints.HORIZONTAL, 5, 5);
createButton("*", 3, 4, 1, 1,GridBagConstraints.HORIZONTAL, 5, 5);
createButton("/", 4, 4, 1, 1,GridBagConstraints.HORIZONTAL, 5, 5);
createButton("1", 0, 5, 1, 1,GridBagConstraints.HORIZONTAL, 5, 0);
createButton("2", 1, 5, 1, 1,GridBagConstraints.HORIZONTAL, 5, 5);
createButton("3", 2, 5, 1, 1,GridBagConstraints.HORIZONTAL, 5, 5);
createButton("+", 3, 5, 1, 1,GridBagConstraints.HORIZONTAL, 5, 5);
createButton("-", 4, 5, 1, 1,GridBagConstraints.HORIZONTAL, 5, 5);
createButton(".", 0, 6, 1, 1,GridBagConstraints.HORIZONTAL, 5, 0);
createButton("0", 1, 6, 1, 1,GridBagConstraints.HORIZONTAL, 5, 5);
createButton("1/x", 2, 6, 1, 1,GridBagConstraints.HORIZONTAL, 5, 5);
createButton("=", 3, 6, 2, 1,GridBagConstraints.HORIZONTAL, 5, 5);
label=new JLabel("历史记录");
label.setAutoscrolls(true);
contains.gridx=0;
contains.gridy=7;
contains.gridwidth=5;
contains.gridheight=2;
contains.fill=GridBagConstraints.HORIZONTAL;
panel.add(label,contains);
this.add(panel);
this.setVisible(true);
}
protected void createButton(String name,int x,int y,int w,int h,int hv,int iu,int il)
{
button=new JButton(name);
contains.gridx=x;
contains.gridy=y;
contains.gridwidth=w;
contains.gridheight=h;
contains.insets=new Insets(iu,il,0,0);
contains.fill=hv;
button.addActionListener(this);
panel.add(button,contains);
}
public void calculator()
{
if(s=="+")result=result+Double.parseDouble(valuas);
else if(s=="-")result=result-Double.parseDouble(valuas);
else if(s=="*")result=result*Double.parseDouble(valuas);
else if(s=="/")result=result/Double.parseDouble(valuas);
else if(s=="1/x")result=(1/Double.parseDouble(valuas));
else if(s=="%")result=result/100;
else if(s=="√")result=Math.sqrt(Double.parseDouble(valuas));
else if (s=="x²")result=result*result;
valuas="0";
}
public void actionPerformed(ActionEvent e)
{
// TODO Auto-generated method stub
String type;
JMenuItem mnit = null;
JButton btn = null;
type=e.getSource().toString();
if(type.contains("JMenuItem"))
{
mnit=(JMenuItem)e.getSource();
if(mnit.getText()=="历史记录")
{
System.out.println("历史记录");
JDialog dialog=new JDialog();
dialog.setTitle("历史记录");
dialog.setSize(100,200 );
dialog.add(label);
dialog.setVisible(true);
}
else
if(mnit.getText()=="科学计算器")
{
System.out.println("你的电脑中毒了");
}
else
if(mnit.getText()=="标准计算器")
{
System.out.println("建议立即重启");
}
else
if(mnit.getText()=="作者信息")
{
System.out.println("懒得写了");
}
if(mnit.getText()=="说明")
{
System.out.println("这是一款简单易用的计算器");
}
}
if(type.contains("JButton"))
{
btn= (JButton) e.getSource();
if (btn.getText() == "=")
{
calculator();
labe=labe+"<br>"+str+"="+result;
label.setText("<html>"+"历史记录" +labe+"</html>");
str = String.valueOf(result);
text.setText(str);
s="+";
}
else if (btn.getText() == "x²")
{
str=text.getText();
str=str+"²";
text.setText(str);
calculator();
s="x²";
}
else if (btn.getText() == "1/x")
{
str=text.getText();
str=str+"1/";
text.setText(str);
calculator();
s="1/x";
}
else if (btn.getText() == "删除")
{
str=text.getText();
if(str.length()!=0)
{
if(valuas.length()>=1&&str.length()>=1&&str.charAt(str.length()-1)<='9'&&str.charAt(str.length()-1)>='0')valuas=valuas.substring(0,valuas.length()-1);
else s="+";
if(str.length()>1&&str.substring(str.length()-2,str.length()).equals("1/"))
{
str=str.substring(0,str.length()-2);
}
else str=str.substring(0,str.length()-1);
}
text.setText(str);
}
else if (btn.getText() == "清零")
{
text.setText("");
valuas="0";
result=0;
s="+";
labe="";
label.setText("<html>"+"历史记录" +labe+"</html>");
}
else if (btn.getText() == "+")
{
str=text.getText();
str=str+"+";
text.setText(str);
calculator();
s = "+";
}
else if (btn.getText() == "-")
{
str=text.getText();
str=str+"-";
text.setText(str);
calculator();
s = "-";
}
else if (btn.getText() == "/")
{
str=text.getText();
str=str+"/";
text.setText(str);
calculator();
s = "/";
}
else if (btn.getText() == "*")
{
str=text.getText();
str=str+"*";
text.setText(str);
calculator();
s = "*";
}
else if (btn.getText() == "%")
{
str=text.getText();
str=str+"%";
text.setText(str);
calculator();
s = "%";
}
else if (btn.getText() == "√")
{
str=text.getText();
str=str+"√";
text.setText(str);
calculator();
s = "√";
}
else
{
str=text.getText();
str=str+btn.getText();
valuas=valuas+btn.getText();
text.setText(str);
}
}
/*System.out.println(valuas);
System.out.println(result);
System.out.println(s);*/
}
/**
* @param args
*/
public void password()
{
JDialog dialog=new JDialog();
dialog.setTitle("请输入密码");
//dialog.setSize(100,200 );
dialog.setLayout(new GridLayout(3,1,10,10));
label.setText("<html>"+"计算器已上锁" +"<br>"+"请输入密码解锁"+"</html>");
dialog.add(label);
dialog.add(text);
dialog.setBounds(600, 400, 200, 150);
dialog.setVisible(true);
}
public static void main(String[] args) {
// TODO Auto-generated method stub
Calculatordemo cal =new Calculatordemo();
cal.addWindowListener(cal);
}
public void windowClosing(WindowEvent e)
{
System.out.println("正关闭窗口");
System.exit(0);
}
public void windowActivated(WindowEvent e)
{
System.out.println("取得主控窗口");
}
public void windowDeactivated(WindowEvent e)
{
password();
}
public void windowDeiconified(WindowEvent e)
{
System.out.println("还原窗口");
}
public void windowIconified(WindowEvent e)
{
System.out.println("最小化窗口");
}
public void windowOpened(WindowEvent e)
{
System.out.println("窗口已打开");
}
public void windowClosed(WindowEvent e)
{
System.out.println("窗口已关闭");
}
}
- 实验结果
计算器演示：
如1+2+3+4+5+6=
一次完成
分次完成
如8²+3*6+5/6=
如1/3+√5+%80*100=
有什么疑问可评论区提问.