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四则运算式java代码 java四则运算代码( 二 )

IT技术String


double k = Double.parseDouble(str1);
k =k*k*k;
text1.setText(String.valueOf(k));
}
else if(s.equals("PI")){//显示圆周率
double Pi=3.1415926;
String pi=String.valueOf(Pi);
text1.setText(pi);
}
else if(s.equals("+/-")){//变换正负号
double a = 0;
str1=text1.getText();
a=Double.parseDouble(str1.trim());
a=-1*a;
str1=String.valueOf(a);
text1.setText(str1);
}
else if(s.equals("1/x")){//求倒
str1=text1.getText();
double i = 1/Double.parseDouble(str1.trim());
String k = String.valueOf(i);
text1.setText(k);
}
else if(s.equals(".")){//小数点
clickable=true;
for (int i = 0; itext1.getText().length(); i++)
if ('.' == text1.getText().charAt(i))
{
clickable=false;
break;
}//第一层判断是否里面含有小数点;
if(clickable==true)//第二层判断
text1.setText(text1.getText()+".");
i=false;
}
else if(s.equals("C")){//清零 所有的数据变回初始值
value = https://www.04ip.com/post/0;
text1.setText("0");
i=true;
operate = "=" ;
}
else if ('0' = s.charAt(0)s.charAt(0) = '9' ) {//若输入的为数字以及小数点的时候执行下面
if (i) {//判断获得的command是否为操作符
text1.setText(s);
}
else {
text1.setText(text1.getText() + s);
}
i = false;
}
else {//若输入运算操作符的话则执行下面的代码
count(Double.parseDouble(text1.getText().trim())); //这里一开始调用 count()方法的话首先执行的是operate.equals("=")
//执行上个操作符的运算
operate = s;
i = true;
}
}
private void count(double a) {//计算区域
if (operate.equals("+")) {
value += a;
}
else if (operate.equals("-")) {
value -= a;
}
else if (operate.equals("*")) {
value *= a;
}
else if (operate.equals("/")) {
value /= a;
}
else if (operate.equals("%")) {
value %= a;
}
else if (operate.equals("=")) {
value = https://www.04ip.com/post/a;
}
text1.setText(Double.toString(value));
}
public static void main(String[] arg)
{
calculator cal=new calculator();
}
}
这是例子 四则运算式java代码你可以参考下~监听的 部分
如何用Java编写四则运算程序？（首先建个类，把这些复制粘贴进去）
import java.awt.*;
import javax.swing.*;
public class F {
JFrame frame = new JFrame("计算机");
JPanel pl = new JPanel();
JPanel p2 = new JPanel();
static JTextField show = new JTextField();
static JButton b0 = new JButton("0");
static JButton b1 = new JButton("1");
static JButton b2 = new JButton("2");
static JButton b3 = new JButton("3");
static JButton b4 = new JButton("4");
static JButton b5 = new JButton("5");
static JButton b6 = new JButton("6");
static JButton b7 = new JButton("7");
static JButton b8 = new JButton("8");
static JButton b9 = new JButton("9");
JButton bjia = new JButton("+");
JButton bjian = new JButton("-");
JButton bcheng = new JButton("*");
JButton bchu = new JButton("/");
JButton bdian = new JButton(".");
JButton bdeng = new JButton("=");
JButton bqingchu = new JButton("清除");
public void y() {
pl.setLayout(new GridLayout(1, 1));
pl.add(show);
}
public void p() {
b1.addActionListener(new U());
b2.addActionListener(new U());
b3.addActionListener(new U());
b4.addActionListener(new U());
b5.addActionListener(new U());
b6.addActionListener(new U());
b7.addActionListener(new U());
b8.addActionListener(new U());
b9.addActionListener(new U());

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