給你一個比較簡單的吧。以前寫的。
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共兩個類。還只是完成+、-、×、÷運算而已。
GUI只是用了AWT,很簡單,相信一看就能懂了。
Calculator.java
public class Calculator{
private String result = "0";
private int op = 0,add = 1,sub = 2,mul = 3,div = 4;
private double stringToDouble(String x){
double y = Double.parseDouble(x);
return y;
}
private void operate(String x){
double x1 = stringToDouble(x);
double y = stringToDouble(result);
switch (op){
case 0:
result = x;
break;
case 1:
result = String.valueOf(y+x1);
break;
case 2:
result = String.valueOf(y-x1);
break;
case 3:
result = String.valueOf(y*x1);
break;
case 4:
if(x1!=0){
result = String.valueOf(y/x1);
}else{
result = "The divisor can't be zero!";
}
break;
}
}
public String opAdd(String x){
operate(x);
op = add;
return result;
}
public String opSubtract(String x){
operate(x);
op = sub;
return result;
}
public String opMultiply(String x){
operate(x);
op = mul;
return result;
}
public String opDivide(String x){
operate(x);
op = div;
return result;
}
public String opEquals(String x){
operate(x);
op = 0;
return result;
}
public void opClean(){
op = 0;
result = "0";
}
}
CalculatorGUI.java
import java.awt.*;
import java.awt.event.*;
import java.util.EventObject;
public class CalculatorGUI{
private Frame f;
private Panel p1,p2;
private Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9;
private Button bPoint,bAdd,bDec,bMul,bDiv,bCal;
private TextField tf;
private String s,op;
private Calculator cal = new Calculator();
private boolean ifOp;
public CalculatorGUI(){
f = new Frame("Calculator");
p1 = new Panel();
p2 = new Panel();
b0 = new Button("0");
b1 = new Button("1");
b2 = new Button("2");
b3 = new Button("3");
b4 = new Button("4");
b5 = new Button("5");
b6 = new Button("6");
b7 = new Button("7");
b8 = new Button("8");
b9 = new Button("9");
bPoint = new Button(".");
bAdd = new Button("+");
bDec = new Button("-");
bMul = new Button("*");
bDiv = new Button("/");
bCal = new Button("=");
tf = new TextField(25);
tf.setEditable(false);
}
public void launchFrame(){
f.setSize(220,160);
f.setResizable(false);
f.addWindowListener(new myWindowListener());
p1.setLayout(new FlowLayout(FlowLayout.CENTER));
p1.add(tf);
f.add(p1,BorderLayout.NORTH);
p2.setLayout(new GridLayout(4,4));
b0.addActionListener(new setLabelText_ActionListener());
b1.addActionListener(new setLabelText_ActionListener());
b2.addActionListener(new setLabelText_ActionListener());
b3.addActionListener(new setLabelText_ActionListener());
b4.addActionListener(new setLabelText_ActionListener());
b5.addActionListener(new setLabelText_ActionListener());
b6.addActionListener(new setLabelText_ActionListener());
b7.addActionListener(new setLabelText_ActionListener());
b8.addActionListener(new setLabelText_ActionListener());
b9.addActionListener(new setLabelText_ActionListener());
bPoint.addActionListener(new setLabelText_ActionListener());
bAdd.addActionListener(new setOperator_ActionListener());
bDec.addActionListener(new setOperator_ActionListener());
bMul.addActionListener(new setOperator_ActionListener());
bDiv.addActionListener(new setOperator_ActionListener());
bCal.addActionListener(new setOperator_ActionListener());
p2.add(b7);
p2.add(b8);
p2.add(b9);
p2.add(bAdd);
p2.add(b4);
p2.add(b5);
p2.add(b6);
p2.add(bDec);
p2.add(b1);
p2.add(b2);
p2.add(b3);
p2.add(bMul);
p2.add(b0);
p2.add(bPoint);
p2.add(bCal);
p2.add(bDiv);
f.add(p2,BorderLayout.SOUTH);
f.setVisible(true);
}
public void setTextFieldText_Temp(){
if (tf.getText().length()15 (tf.getText().indexOf(".")==-1 || !s.equals("."))){
tf.setText(tf.getText()+s);
}else{
tf.setText((tf.getText()+s).substring(0,15));
}
}
public void setTextFieldText(){
if(ifOp){
ifOp = false;
tf.setText("");
setTextFieldText_Temp();
}else{
setTextFieldText_Temp();
}
}
public static void main(String[] args){
CalculatorGUI calculator = new CalculatorGUI();
calculator.launchFrame();
}
class myWindowListener extends WindowAdapter{
public void windowClosing(WindowEvent e){
System.exit(0);
}
}
class setLabelText_ActionListener implements ActionListener{
public void actionPerformed(ActionEvent e){
Button tempB = (Button)e.getSource();
s = tempB.getLabel();
setTextFieldText();
}
}
class setOperator_ActionListener implements ActionListener{
public void actionPerformed(ActionEvent e){
Button tempB = (Button)e.getSource();
op = tempB.getLabel();
if(op.equals("+")){
tf.setText(cal.opAdd(tf.getText()));
ifOp = true;
}else if(op.equals("-")){
tf.setText(cal.opSubtract(tf.getText()));
ifOp = true;
}else if(op.equals("*")){
tf.setText(cal.opMultiply(tf.getText()));
ifOp = true;
}else if(op.equals("/")){
tf.setText(cal.opDivide(tf.getText()));
ifOp = true;
}else if(op.equals("=")){
tf.setText(cal.opEquals(tf.getText()));
ifOp = true;
}
}
}
}
java課程設計題目及代碼分別是:
1、題目:計算器。設計內容是設計一個圖形界面(GUI)的計算器應用程序,完成簡單的算術運算。
設計要求是設計的計算器應用程序可以完成家法、減法、乘法、除法和取余運算。且有小數(shù)點、正負號、求倒數(shù)、退格和清零功能。
2、代碼:
數(shù)字按鈕NumberButton類如下:
import java.awt.
import java.awt.event.
import javax.swing.
public class NumberButton extends Button.
{
int number.
public NumberButton(int number).
{
super(""+number).
this.number=number.
setForeground(Color.blue).
}
public int getNumber().
{
return number;
}
}
其它java課程設計題目及代碼是:
題目:華容道。編寫一個按鈕的子類,使用該子類創(chuàng)建的對象代表華容道中的人物。通過焦點事件控制人物顏色,當人物獲得焦點時顏色為藍色,當失去焦點時顏色為灰色。
通過鍵盤事件和鼠標事件來實現(xiàn)曹操、關羽等人物的移動。當人物上發(fā)生鼠標事件或鍵盤事件時,如果鼠標指針的位置是在人物的下方(也就是組件的下半部分)或按下鍵盤的“↓“鍵,該人物向下移動。向左、向右和向上的移動原理類似。
代碼是:
String name[]={"曹操","關羽","張","劉","馬","許","兵","兵","兵","兵"}.
for(int i=0;iname.length;i++).
{
person[i]=new Person(i,name[i]).
person[i].addKeyListener(this).
person[i].addMouseListener(this).
//? ? ?person[i].addFocusListener(new Person).
add(person[i]).
}
person[0].setBounds(104,54,100,100).
person[1].setBounds(104,154,100,50).
person[2].setBounds(54,154,50,100).
person[3].setBounds(204,154,50,100).
person[4].setBounds(54,54,50,100).
person[5].setBounds(204,54,50,100);
person[6].setBounds(54,254,50,50);
person[7].setBounds(204,254,50,50);
person[8].setBounds(104,204,50,50);
person[9].setBounds(154,204,50,50);
這一堆代碼都是給按鈕添加事件,從給出的代碼可以看到有數(shù)字:9?0?小數(shù)點、還有加減乘除的事件
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
//暫時不用考慮連加問題
//點第一個運算符 點運算符 點第二個運算符 點=出結果
public class 計算器 implements ActionListener {
JTextField jtf = new JTextField(10);
private boolean append = false;
private String op1 = "0";
private String operator = "+";
@Override
public void actionPerformed(ActionEvent e) {
String comn = e.getActionCommand();
// 處理數(shù)字
if ("0123456789".indexOf(comn) != -1) {
if (append) {// 追加
String temp = jtf.getText();
jtf.setText(temp + comn);
} else {// 替換
jtf.setText(comn);
append = true;
}
}
// 處理運算符
else if ("+-*/".indexOf(comn) != -1) {
op1 = jtf.getText();
operator = comn;
append = false;
} else if ("=".indexOf(comn) != -1) {
String op2 = jtf.getText();
double d1 = Double.parseDouble(op1);
double d2 = Double.parseDouble(op2);
if ("+".equals(operator)) {
d1 = d1 + d2;
} else if ("-".equals(operator)) {
d1 = d1 - d2;
} else if ("*".equals(operator)) {
d1 = d1 * d2;
} else if ("/".equals(operator)) {
d1 = d1 / d2;
}
jtf.setText(d1 + "");
append = false;
} else if (".".equals(comn)) {
String temp = jtf.getText();
if (temp.indexOf(".") == -1) {
jtf.setText(temp + ".");
append = true;
}
} else if ("+/-".equals(comn)) {
String temp = jtf.getText();
if (temp.startsWith("-1")) {
jtf.setText(temp.substring(1));
} else {
jtf.setText("-" + temp);
}
} else if ("Backspace".equals(comn)) {
String temp = jtf.getText();
if (temp.length() 0) {
jtf.setText(temp.substring(0, temp.length() - 1));
}
} else if ("CE".equals(comn) || "C".equals(comn)) {
jtf.setText("0");
append = false;
}
}
public 計算器() {
JFrame jf = new JFrame("計算器");
jf.add(jtf, BorderLayout.NORTH);
String[] s1 = { "Backspace", "CE", "C", "+", "7", "8", "9", "/", "4",
"5", "6", "*", "1", "2", "3", "-", "0", "+/-", ".", "=" };
JPanel jp = new JPanel();
jf.add(jp, BorderLayout.CENTER);
GridLayout gl = new GridLayout(5, 4);
jp.setLayout(gl);
JButton[] jb = new JButton[s1.length];
for (int i = 0; i s1.length; i++) {
jb[i] = new JButton(s1[i]);
jp.add(jb[i]);
jb[i].addActionListener(this);
}
jf.add(jp);
jtf.setEditable(false);
jf.setLocation(400, 300);
jf.pack();
jf.setResizable(false);// 設置窗口的大小不可變
jf.setDefaultCloseOperation(jf.EXIT_ON_CLOSE);
jf.setVisible(true);
}
public static void main(String[] args) {
new 計算器();
}
}
這個功能比較簡單 不知道能不能滿足要求
import javax.swing.*;
import javax.swing.JTextField;
import java.awt.*;
import java.awt.event.*;
import java.lang.*;
import java.awt.Color;
public class Ex5_2 extends JFrame implements ActionListener
{
private JPanel p1 = new JPanel(); //創(chuàng)建面板
private JPanel p2 = new JPanel();
private JTextField t1; //文本框1用來顯示輸入信息
private JTextField t2; //文本框2用來顯示結果信息
private JLabel label; //標簽信息
StringBuffer str; //顯示屏所顯示的字符串
double x,y; //x和y都是運算數(shù)
int z; //Z表示單擊了那一個運算符.0表示"+",1表示"-",2表示"*",3表示"/"
private JButton b[] = new JButton[12]; //創(chuàng)建一個有12個按鈕的數(shù)組
private JButton b1,b2,b3,b4,b5,b6,b7,b8; //算術功能按鈕
public Ex5_2()
{
super("簡易計算器"); //窗口名稱
Container c = getContentPane(); //創(chuàng)建內容面板對象
t1 = new JTextField(30);
t1.setEditable(false); //只能顯示,不能編輯
t2 = new JTextField(30);
t2.setEditable(false); //只能顯示,不能編輯
label = new JLabel("歡迎使用小巫版計算器^_^o~ 努力!");
label.setForeground(Color.blue);
//創(chuàng)建一個空字符串緩沖區(qū)
str=new StringBuffer();
p2.add(label); //添加標簽到面板
p2.add(t2); //添加文本框到面板
p2.add(t1); //添加文本框到面板
p2.setLayout(new GridLayout(4,1)); //把面扳布局為4行1列
for(int i=0;i10;i++) //分別為數(shù)組中0~9號的按鈕設置標簽,并注冊監(jiān)聽器
{
String s=""+i;
b[i]= new JButton(s);
b[i].addActionListener(this);
}
//實例化各個按鈕
b[10]= new JButton("-/+"); b[11]= new JButton(".");
b1= new JButton("/"); b2= new JButton("Back");
b3= new JButton("*"); b4= new JButton("C");
b5= new JButton("+"); b6= new JButton("Sqrt");
b7= new JButton("-"); b8= new JButton("=");
//設置按鈕前景色
for(int i=0;i12;i++)
{
b[i].setForeground(Color.blue);
}
b1.setForeground(Color.red); b3.setForeground(Color.red);
b5.setForeground(Color.red); b7.setForeground(Color.red);
b2.setForeground(Color.blue); b4.setForeground(Color.blue);
b6.setForeground(Color.red); b8.setForeground(Color.blue);
//添加到面板
p1.add(b[7]); p1.add(b[8]); p1.add(b[9]); p1.add(b1); p1.add(b2);
p1.add(b[4]); p1.add(b[5]); p1.add(b[6]); p1.add(b3); p1.add(b4);
p1.add(b[1]); p1.add(b[2]); p1.add(b[3]); p1.add(b5); p1.add(b6);
p1.add(b[0]); p1.add(b[10]); p1.add(b[11]);p1.add(b7);p1.add(b8);
p1.setLayout(new GridLayout(4,5,5,5));
//注冊監(jiān)聽器
b[10].addActionListener(this); b[11].addActionListener(this);
b1.addActionListener(this); b2.addActionListener(this);
b3.addActionListener(this); b4.addActionListener(this);
b5.addActionListener(this); b6.addActionListener(this);
b7.addActionListener(this); b8.addActionListener(this);
//將面板添加到內容面板
c.add(p2);
c.add(p1);
c.setLayout(new FlowLayout()); //設置為順序布局
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //設置窗口關閉動作
setVisible(true); //設置為可見
setResizable(false); //禁止調整框架大小
setSize(400,300); //設置窗口大小
}
//主方法實現(xiàn)創(chuàng)建一個窗口
public static void main(String[] args)
{ Ex5_2 f = new Ex5_2(); }
//按鈕的事件處理
public void actionPerformed(ActionEvent e)
{
try
{
if(e.getSource()==b4) //選擇"C"清零
{
t1.setText("0"); //把文本框清零
t1.setHorizontalAlignment(JTextField.RIGHT); //文本對齊右邊
str.setLength(0); //清空字符串緩沖區(qū)以準備接收新的輸入運算數(shù)
}
else if(e.getSource()==b[10])//單擊"+/-"選擇輸入的運算數(shù)是正數(shù)還是負數(shù)
{
x=Double.parseDouble(t1.getText().trim());//trim函數(shù)作用是去掉字符串中的空格
t1.setText(""+(-x));
t1.setHorizontalAlignment(JTextField.RIGHT);
}
else if (e.getSource()==b5)//單擊加號按鈕獲得x的值和z的值并清空y的值
{
x=Double.parseDouble(t1.getText().trim());
str.setLength(0);
y=0d;
z=0;
}
else if(e.getSource()==b7)//單擊減號按鈕獲得x的值和z的值并清空y的值
{
x=Double.parseDouble(t1.getText().trim());
str.setLength(0);
y=0d;
z=1;
}
else if(e.getSource()==b3)//單擊乘號按鈕獲得x的值和z的值并清空y的值
{
x=Double.parseDouble(t1.getText().trim());
str.setLength(0);
y=0d;
z=2;
}
else if(e.getSource()==b1)//單擊除號按鈕獲得x的值和z的值并清空y的值
{
x=Double.parseDouble(t1.getText().trim());
str.setLength(0);
y=0d;
z=3;
}
else if(e.getSource()==b8)//單擊等號按鈕輸出計算結果
{
str.setLength(0);
switch(z)
{
case 0: t1.setText(""+(x+y)); t1.setHorizontalAlignment(JTextField.RIGHT);break;
case 1: t1.setText(""+(x-y)); t1.setHorizontalAlignment(JTextField.RIGHT);break;
case 2: t1.setText(""+(x*y)); t1.setHorizontalAlignment(JTextField.RIGHT);break;
case 3: t1.setText(""+(x/y)); t1.setHorizontalAlignment(JTextField.RIGHT);break;
}
}
else if(e.getSource()==b[11])//單擊"."按鈕輸入小數(shù)
{
if(t1.getText().trim().indexOf('.')!=-1)//判斷字符串中是否已經包含了小數(shù)點
{
}
else //如果沒有小數(shù)點
{
if(t1.getText().trim().equals("0"))//如果初時顯示為0
{
t1.setText(str.append(e.getActionCommand()).toString());
t1.setHorizontalAlignment(JTextField.RIGHT);
}
else if(t1.getText().trim().equals(""))//如果初時顯示為空則不做任何操作
{}
else
{
t1.setText(str.append(e.getActionCommand()).toString());
t1.setHorizontalAlignment(JTextField.RIGHT);
}
}
y=0d;
}
else if(e.getSource()==b6) //求平方根
{
x=Double.parseDouble(t1.getText().trim());
if(x0)
{
t1.setText("數(shù)字格式異常");
t1.setHorizontalAlignment(JTextField.RIGHT);
}
else
{
t1.setText(""+Math.sqrt(x));
t1.setHorizontalAlignment(JTextField.RIGHT);
}
str.setLength(0);
y=0d;
}
else
{
if(e.getSource()==b[0])//如果選擇的是"0"這個數(shù)字鍵
{
if(t1.getText().trim().equals("0"))//如果顯示屏顯示的為零不做操作
{}
else
t1.setText(str.append(e.getActionCommand()).toString());
t1.setHorizontalAlignment(JTextField.RIGHT);
y=Double.parseDouble(t1.getText().trim());
}
else if (e.getSource()==b2) //選擇的是back鍵
{
if(!t1.getText().trim().equals("0"))//如果顯示屏顯示的不是零
{
if(str.length()!=1)
{
t1.setText(str.delete(str.length()-1,str.length()).toString());//可能拋出字符串越界異常
t1.setHorizontalAlignment(JTextField.RIGHT);
}
else
{
t1.setText("0"); t1.setHorizontalAlignment(JTextField.RIGHT);
str.setLength(0);
}
}
y=Double.parseDouble(t1.getText().trim());
}
else
{
t1.setText(str.append(e.getActionCommand()).toString());
t1.setHorizontalAlignment(JTextField.RIGHT);
y=Double.parseDouble(t1.getText().trim());
}
}
}
catch(NumberFormatException e1){ t1.setText("數(shù)字格式異常");
t1.setHorizontalAlignment(JTextField.RIGHT); }
catch(StringIndexOutOfBoundsException e1){t1.setText("字符串索引越界");
t1.setHorizontalAlignment(JTextField.RIGHT);}
}
}