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874天前/** |
* 计算器 |
* @author 刘兴 |
* |
*/ |
public class Calculator extends JFrame implements ActionListener{ |
|
//定义创建组件 |
JTextField t=new JTextField(20); |
JButton[] b=new JButton[27]; |
String[] s={"Backspace","CE","C", |
"MC","7","8","9","/","sqrt", |
"MR","4","5","6","*","%", |
"MS","1","2","3","-","1/x", |
"M+","0","+/-",".","+","=" |
}; |
JMenuBar jmb = new JMenuBar(); |
JMenu jm1 = new JMenu("编辑(E)"); |
JMenu jm2 = new JMenu("查看(V)"); |
JMenu jm3 = new JMenu("帮助(H)"); |
JMenuItem jmi1 = new JMenuItem("复制(C)"); |
JMenuItem jmi2 = new JMenuItem("粘贴(P)"); |
public Calculator() { |
|
this.setLayout(null); |
this.add(t); |
t.setHorizontalAlignment(JTextField.RIGHT); |
t.setEditable(false); |
t.setBounds(10,10,400,30); |
|
//添加按钮，同时注册监听 |
for(int i=0;i<27;i++){ |
b[i]=new JButton(s[i]); |
b[i].addActionListener(this);//注册监听 |
b[i].setActionCommand(s[i]); |
this.add(b[i]); |
} |
|
//下面设置各个按钮之间的距离以及按钮的大小 |
//前三个按钮设置为大小100，30，间距为10 |
for(int i=0;i<3;i++){ |
b[i].setBounds(90+110*i,50,100,30); |
} |
|
//剩余的按钮大小相同，只是间距有所不同 |
int n=3; |
for(int i=0;i<4;i++){ |
for(int j=0;j<6;j++){ |
if((n-3)%6==0){ |
b[n].setBounds(10,90+35*i,60,30); |
}else{ |
b[n].setBounds(90+65*(j-1),90+35*i,60,30); |
} |
n++; |
} |
} |
|
//设置菜单 |
this.setJMenuBar(jmb); |
jmb.add(jm1); |
jmb.add(jm2); |
jmb.add(jm3); |
jmi1.setMnemonic('C'); |
jmi1.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,InputEvent.CTRL_MASK)); |
jmi2.setMnemonic('V'); |
jmi2.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,InputEvent.CTRL_MASK)); |
jm1.add(jmi1); |
jm1.add(jmi2); |
jmi1.addActionListener(this);//注册菜单监听 |
jmi2.addActionListener(this); |
jmi1.setActionCommand("copy"); |
jmi2.setActionCommand("paste"); |
//设置窗体 |
this.setTitle("计算器"); |
ImageIcon icon = new ImageIcon("images/jisuan.jpg"); |
this.setIconImage(icon.getImage()); |
this.setSize(430,290); |
this.setLocation(200,200); |
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); |
this.setResizable(false); |
this.setVisible(true); |
} |
|
public static void main(String[] args) { |
new Calculator(); |
} |
String text[] = {"",""} ; |
String showString = "";//要显示的字符串 |
int dotCount = 0;//点击小数点的次数 |
int j = 0;//用来表示是第几个操作数 |
int op = -1; //操作类型，0:/;1:*;2:-;3:+;4:% |
int flag = 0; |
String copyedString = ""; |
@Override |
public void actionPerformed(ActionEvent e) { |
String comand = e.getActionCommand(); |
if("copy".equals(comand)){ |
copyedString = t.getText(); |
} |
if("paste".equals(comand)){ |
if(!("".equals(copyedString))){ |
showString = copyedString; |
text[j] = copyedString; |
} |
} |
for(int i = 4; i<7; i++){ //点击7、8、9 |
if(s[i].equals(comand)) text[j] += s[i]; |
showString = text[j]; |
} |
for(int i = 10; i<13; i++){//点击4、5、6 |
if(s[i].equals(comand)) text[j] += s[i]; |
showString = text[j]; |
} |
for(int i = 16; i<19; i++){//点击1、2、3 |
if(s[i].equals(comand)) text[j] += s[i]; |
showString = text[j]; |
} |
if(s[22].equals(comand)) {//点击0 |
text[j] += s[22]; |
showString = text[j]; |
} |
if(s[24].equals(comand)){ //点击".",只允许点一次，点第二次不给反应 |
if(dotCount == 0) { |
text[j] += s[24]; |
showString = text[j]; |
dotCount ++; |
} |
} |
if(s[7].equals(comand)){//点击"/" |
showString = operator(); |
text[0] = showString; |
text[1] = ""; |
op = 0; |
j = 1;//下面要换成text[1]来记录第二个操作数 |
} |
if(s[13].equals(comand)){//点击"*",只能点一次 |
showString = operator(); |
text[0] = showString; |
text[1] = ""; |
op = 1; |
j = 1;//下面要换成text[1]来记录第二个操作数 |
} |
if(s[19].equals(comand)){//点击"-",只能点一次 |
showString = operator(); |
text[0] = showString; |
text[1] = ""; |
op = 2; |
j = 1;//下面要换成text[1]来记录第二个操作数 |
} |
if(s[25].equals(comand)){//点击"+",只能点一次 |
showString = operator(); |
text[0] = showString; |
text[1] = ""; |
op = 3; |
j = 1;//下面要换成text[1]来记录第二个操作数 |
} |
if(s[14].equals(comand)){//点击% |
if(j==0) { |
op = 4; |
j = 1; |
} |
} |
if(s[0].equals(comand)){//点击Backspace |
int len = text[j].length(); |
if(len > 0){ |
text[j] = text[j].substring(0,text[j].length()-1); |
showString = text[j]; |
} |
} |
if(s[2].equals(comand)){//点击c |
text[j] = ""; |
showString = ""; |
} |
if(s[23].equals(comand)){//点击+/- |
if(flag == 0){ |
text[j] = "-"+text[j]; |
showString = text[j]; |
flag = 1; |
}else if(flag==1){ |
text[j] = showString.substring(1,showString.length()); |
showString = text[j]; |
flag = 0; |
} |
System.out.println("flag===="+flag); |
} |
if(s[26].equals(comand)){//点击= |
showString = operator(); |
} |
if(s[1].equals(comand)){//点击CE |
//此处直接将所有的数据全部恢复初始值，同时将文本框中的数值清空 |
text[0] = ""; |
text[1] = ""; |
t.setText(""); |
showString = ""; |
dotCount = 0; |
op = -1; |
j = 0; |
} |
if(s[20].equals(comand)){//点击1/x |
if(!("".equals(text[j]))){ |
double num = Double.parseDouble(text[j]); |
num = 1/num; |
text[j] = num+""; |
showString = num+""; |
} |
} |
if(s[8].equals(comand)){//点击sqrt |
if(!("".equals(text[j]))){ |
double num = Double.parseDouble(text[j]); |
num = Math.sqrt(num); |
text[j] = dealResult(num+""); |
showString = text[j]; |
} |
} |
t.setText(showString); |
} |
|
public String operator(){//进行计算 |
if("".equals(text[1]) || "".equals(text[0])){ |
return text[0]; |
} |
double op1 = Double.parseDouble(text[0]);//得到第一个操作数 |
double op2 = Double.parseDouble(text[1]);//得到第二个操作数 |
double result = 0.0; |
//进行计算 |
switch (op) { |
case 0://除 |
if(op2 != 0){//除法时第二操作数不能是0 |
result = op1 / op2; |
} |
break; |
case 1://乘 |
result = op1*op2; |
break; |
case 2://减 |
result = op1-op2; |
break; |
case 3://加 |
result = op1 + op2; |
break; |
case 4: |
int mu1 = (int)op1; |
int mu2 = (int)op2; |
if((op1 == mu1) && (op1 == mu2)){//整除需要两个操作数都是整数 |
result = (int)op1%(int)op2; |
System.out.println("zhen"); |
}else{ |
result = op2; |
} |
break; |
default: |
break; |
} |
String resString = result+""; |
resString = dealResult(resString); |
return resString; |
} |
|
String dealResult(String resString){ |
int dotpos = resString.indexOf("."); |
if(resString.substring(dotpos+1, resString.length()).equals("0")){ |
resString = resString.substring(0,dotpos); |
} |
return resString; |
} |
} |
高级设计师
by: 小蜜锋 发表于：2014-02-21 18:51:57 顶(0) | 踩(0) 回复
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