在java中一个混合运算10+'a'+1.5*3,它是怎么运算的结果是111.5

你注意一下Java在运算时候的一些规则即可：

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1）在优先级相同的情况下，Java是从左到右计算的；

2）在不同类型之间进行计算时，Java一般会将内部宽度比较小的将转换成大的，以避免溢出。

比如10是int，内部32位，'a'是char类型，内部16位，

‘a'是一个char类型，其ascii码是97，在运算时就是用的是这个值；

将其转换成32位的int的97

3) 运算符是有优先级的。乘法的优先级高于加法，这和你学过的数学知识是一致的。最后遇到的1.5*3会得到double类型的4.5

因此最后结果就是 10 + 97 + 4.5 = 111.5，

但是，如果你是用System.out.println打印的，java转换成最高精度，也就是double并显示；

如果你把这个值赋给了int，那么结果是111，会舍去小数（而不是四舍五入）。

怎么用JAVA做加减混合运算?

import java.util.Scanner;

public class HybridOperation {

public static void main(String[] args) {

Scanner input = new Scanner(System.in);

System.out.println("输入一个表达式:");

String s = input.nextLine().trim();

int n = s.length();

int sum = 0;

int p = -1;

char a = '+';

for (int i = 1; i n; i++) {

char ch = s.charAt(i);

if (ch == '+' || ch == '-') {

if (a == '+') {

sum += Integer.parseInt(s.substring(p + 1, i));

a = ch;

p = i;

} else if (a == '-') {

sum -= Integer.parseInt(s.substring(p + 1, i));

a = ch;

p = i;

}

}

}

if (a == '+') {

sum += Integer.parseInt(s.substring(p + 1));

}

if (a == '-') {

sum -= Integer.parseInt(s.substring(p + 1));

}

System.out.println(s+" = "+sum);

}

}

可以实现任意次数的加减，

如：1+2+3-2

正整数加减乘除四则混合运算求值方法 java

您好：

首先在类中定义 加减乘除 四个函数（因整数除法会有小数，因此类型定义为double），具体如下：

根据自己的混合运算要求，组合以上方法即可，例如：((3+4)*2-6)/4 = 2

希望对你有帮助！

用JAVA实现复数的混合运算的源程序

public class Complex

{

private double realPart;

private double imaginaryPart;

public Complex(double a, double b)

{

this.realPart = a;

this.imaginaryPart = b;

}

public Complex add(Complex a)

{

Complex result = new Complex(this.realPart + a.realPart, this.imaginaryPart + a.imaginaryPart);//(why?)

return result;

}

public Complex decrease(Complex a)

{

Complex result = new Complex(this.realPart - a.realPart, this.imaginaryPart - a.imaginaryPart);//(why?)

return result;

}

public Complex multiply(Complex a)

{

double newReal = this.realPart*a.realPart - this.imaginaryPart * a.imaginaryPart;

double newImaginary = this.realPart*a.imaginaryPart + this.imaginaryPart * a.realPart;

Complex result = new Complex(newReal, newImaginary);

return result;

}

public Complex divide(Complex a)

{

Complex conjugate = new Complex(this.realPart, -this.imaginaryPart);

Complex multiplication = conjugate.multiply(a);

multiplication.realPart /= this.realPart*this.realPart + this.imaginaryPart * this.imaginaryPart;

multiplication.imaginaryPart /= this.realPart*this.realPart + this.imaginaryPart * this.imaginaryPart;

return multiplication;

}

public String toString()

{

String show = this.realPart + " + " + this.imaginaryPart + "i";

return show;

}

public static void main(String [] args)

{

Complex a = new Complex (2, 3);

Complex b = new Complex (1,1);

System.out.println((a.add(b)).toString());

System.out.println((a.decrease(b)).toString());

System.out.println((a.multiply(b)).toString());

System.out.println((a.divide(b)).toString());

}

}

java反射来做一个四则混合运算

我这给你个简单的只算加法的例子吧

先编写一个用于进行加法运算的类

CalcPlus.java

package com.test.reflact;

public class CalcPlus

{

public double plus(double num1,double num2)

{

return num1+num2;

}

}

然后编写新的测试类用于调用CalcPlus的plus进行计算

ReflectDemo.java

package com.test.reflact;

public class ReflectDemo

{

public static void main(String[] args)

{

try

{

//通过反射加载加法计算类

Class plusClass = Class.forName("com.test.reflact.CalcPlus");

//创建加法计算类的实例

CalcPlus plusInstance = (CalcPlus) plusClass.newInstance();

double num1 = 5.5;

double num2 = 8.6;

//进行计算并输出结果

System.out.println(plusInstance.plus(num1, num2));

} catch (ClassNotFoundException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

} catch (InstantiationException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IllegalAccessException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

求一个带四则混合运算的JAVA计算器，简单点的。谢谢。十分紧急。

class Stack_Float

{

float nums[];

int top;

Stack_Float()

{

nums = new float[50];

top = -1;

}

boolean IsEmpty()

{

if(top == -1)

return true;

else

return false;

}

float Pop_Stack()

{

if(top==-1)

{

return 0;

}

top--;

return nums[top + 1];

}

float GetTop()

{

return nums[top];

}

void Push_Stack(float num)

{

if(top == 49)

return;

top++;

nums[top] = num;

}

}

/*****************************************************************************/

class Stack_Char

{

char str[];

int top;

Stack_Char()

{

str = new char[50];

top = -1;

}

boolean IsEmpty()

{

if(top==-1)

return true;

else

return false;

}

void Push_Stack(char ch)

{

if(top == 49)

return;

top++;

str[top] = ch;

}

char Pop_Stack()

{

if(top == -1)

return '\0';

top--;

return str[top + 1];

}

char GetTop()

{

if(top == -1)

{

System.out.print("error");

System.exit(0);

}

return str[top];

}

}

/*****************************************************************************/

public class jisuanqi extends javax.swing.JFrame

{

String show = "";

public jisuanqi()

{

initComponents();

}

char[] TranSmit(char str[])

{

char houzhui[] = new char[50]; //存放后缀表达式的字符串

int i = 0,j = 0;

char c = str[i];

Stack_Char s = new Stack_Char(); //存放运算符的栈

while(c != '=') //对算术表达式扫描未结束时

{

if(c = '0' c = '9')

{

while(c = '0' c = '9')//数字直接入栈

{

houzhui[j]=c;

j++;

i++;

c=str[i];

}

houzhui[j]='#';//用#隔开数字

j++;

}

switch(c) //扫描到运算符时

{

case '+':

case '-':

case '*':

case '/':

if(s.IsEmpty() == true) //栈空,直接入栈

{

s.Push_Stack(c);

i++;

c=str[i];

break;

}

if(ComPare(s.GetTop(),c) == -1)

{

s.Push_Stack(c); //入栈

i++;

c=str[i];

break;

}

if(ComPare(s.GetTop(),c) == 1)

{

houzhui[j]=s.Pop_Stack();//出栈元素存入后缀表达式

j++;

break;

}

}

}

while(s.IsEmpty() != true)//把剩余的运算符直接出栈

{

houzhui[j]=s.Pop_Stack();

j++;

}

houzhui[j] = '=';//后缀表达式后面加 =

j++;

houzhui[j] = '\0';

j++;

return houzhui;

}

float Count(char str[])

{

Stack_Float s = new Stack_Float();//定义存放数字的栈

char c = str[0];

int i = 0,j = 0;

float result = 0,temp,left,right;

while(c != '=') //未扫描到 = 时

{

if(c = '0' c = '9')//扫描到数字

{

temp = 0;

while(c != '#')//未读到分隔符时

{

temp = temp * 10 + c - '0';

i++;

c = str[i];

}

s.Push_Stack(temp);//进栈

}

switch(c)//扫描到运算符时

{

case '+':

{

result = s.Pop_Stack() + s.Pop_Stack();//2个数字出栈相加

s.Push_Stack(result);//最后得数进栈

break;

}

case '-':

{

right = s.Pop_Stack();//右操作数出栈

left = s.Pop_Stack();//左操作数出栈

result = left - right;

s.Push_Stack(result);

break;

}

case '*':

{

result = s.Pop_Stack() * s.Pop_Stack();//2个数字出栈相乘

s.Push_Stack(result);

break;

}

case '/':

{

right = s.Pop_Stack();//右操作数出栈

left = s.Pop_Stack();//左操作数出栈

result = left / right;

s.Push_Stack(result);

break;

}

}

i++;

c = str[i];

}

return result;

}

int ComPare(char a,char b) //判断运算符的优先级函数

{

int s[][] =

{// 栈顶元素高于算术表达式中的元素时, 返回 1,否则返回 -1

{1,1,-1,-1},

{1,1,-1,-1},

{1,1,1,1},

{1,1,1,1},

};

char x1[]={'+','-','*','/'};//栈顶元素

char x2[]={'+','-','*','/'};//算术表达式中的元素

int k=0,m,n = 0;

for(m=0;m4;m++) //查找2个进行比较的运算符在表中的位置,并返回比较结果

{

for(n=0;n4;n++)

{

if(x1[m]==ax2[n]==b)

{

k=1;break; //找到比较结果后,跳出循环

}

}

if(k==1)

break;

}

return s[m][n];//返回比较结果

}

/*****************************************************************************/

@SuppressWarnings("unchecked")

// editor-fold defaultstate="collapsed" desc="Generated Code"//GEN-BEGIN:initComponents

private void initComponents() {

text = new javax.swing.JTextField();

jButton1 = new javax.swing.JButton();

jButton2 = new javax.swing.JButton();

jButton3 = new javax.swing.JButton();

jButton4 = new javax.swing.JButton();

jButton5 = new javax.swing.JButton();

jButton6 = new javax.swing.JButton();

jButton7 = new javax.swing.JButton();

jButton8 = new javax.swing.JButton();

jButton9 = new javax.swing.JButton();

jButton10 = new javax.swing.JButton();

jButton11 = new javax.swing.JButton();

jButton12 = new javax.swing.JButton();

jButton13 = new javax.swing.JButton();

jButton14 = new javax.swing.JButton();

jButton21 = new javax.swing.JButton();

jButton22 = new javax.swing.JButton();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

getContentPane().setLayout(null);

getContentPane().add(text);

text.setBounds(10, 10, 270, 30);

jButton1.setText("1");

jButton1.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton1ActionPerformed(evt);

}

});

getContentPane().add(jButton1);

jButton1.setBounds(10, 50, 60, 25);

jButton2.setText("2");

jButton2.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton2ActionPerformed(evt);

}

});

getContentPane().add(jButton2);

jButton2.setBounds(80, 50, 60, 25);

jButton3.setText("3");

jButton3.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton3ActionPerformed(evt);

}

});

getContentPane().add(jButton3);

jButton3.setBounds(150, 50, 60, 25);

jButton4.setText("4");

jButton4.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton4ActionPerformed(evt);

}

});

getContentPane().add(jButton4);

jButton4.setBounds(220, 50, 60, 25);

jButton5.setText("5");

jButton5.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton5ActionPerformed(evt);

}

});

getContentPane().add(jButton5);

jButton5.setBounds(10, 80, 60, 25);

jButton6.setText("6");

jButton6.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton6ActionPerformed(evt);

}

});

getContentPane().add(jButton6);

jButton6.setBounds(80, 80, 60, 25);

jButton7.setText("7");

jButton7.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton7ActionPerformed(evt);

}

});

getContentPane().add(jButton7);

jButton7.setBounds(150, 80, 60, 25);

jButton8.setText("8");

jButton8.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton8ActionPerformed(evt);

}

});

getContentPane().add(jButton8);

jButton8.setBounds(220, 80, 60, 25);

jButton9.setText("9");

jButton9.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton9ActionPerformed(evt);

}

});

getContentPane().add(jButton9);

jButton9.setBounds(10, 110, 60, 25);

jButton10.setText("0");

jButton10.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton10ActionPerformed(evt);

}

});

getContentPane().add(jButton10);

jButton10.setBounds(80, 110, 60, 25);

jButton11.setText("+");

jButton11.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton11ActionPerformed(evt);

}

});

getContentPane().add(jButton11);

jButton11.setBounds(150, 110, 60, 25);

jButton12.setText("-");

jButton12.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton12ActionPerformed(evt);

}

});

getContentPane().add(jButton12);

jButton12.setBounds(220, 110, 60, 25);

jButton13.setText("*");

jButton13.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton13ActionPerformed(evt);

}

});

getContentPane().add(jButton13);

jButton13.setBounds(10, 140, 60, 25);

jButton14.setText("/");

jButton14.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton14ActionPerformed(evt);

}

});

getContentPane().add(jButton14);

jButton14.setBounds(80, 140, 60, 25);

jButton21.setText("CE");

jButton21.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton21ActionPerformed(evt);

}

});

getContentPane().add(jButton21);

jButton21.setBounds(150, 140, 60, 25);

jButton22.setText("=");

jButton22.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton22ActionPerformed(evt);

}

});

getContentPane().add(jButton22);

jButton22.setBounds(220, 140, 60, 25);

pack();

}// /editor-fold//GEN-END:initComponents

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton1ActionPerformed

show += "1";

text.setText(show);

}//GEN-LAST:event_jButton1ActionPerformed

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton2ActionPerformed

show += "2";

text.setText(show);

}//GEN-LAST:event_jButton2ActionPerformed

private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton3ActionPerformed

show += "3";

text.setText(show);

}//GEN-LAST:event_jButton3ActionPerformed

private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton4ActionPerformed

show += "4";

text.setText(show);

}//GEN-LAST:event_jButton4ActionPerformed

private void jButton5ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton5ActionPerformed

show += "5";

text.setText(show);

}//GEN-LAST:event_jButton5ActionPerformed

private void jButton6ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton6ActionPerformed

show += "6";

text.setText(show);

}//GEN-LAST:event_jButton6ActionPerformed

private void jButton7ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton7ActionPerformed

show += "7";

text.setText(show);

}//GEN-LAST:event_jButton7ActionPerformed

private void jButton8ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton8ActionPerformed

show += "8";

text.setText(show);

}//GEN-LAST:event_jButton8ActionPerformed

private void jButton9ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton9ActionPerformed

show += "9";

text.setText(show);

}//GEN-LAST:event_jButton9ActionPerformed

private void jButton10ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton10ActionPerformed

show += "0";

text.setText(show);

}//GEN-LAST:event_jButton10ActionPerformed

private void jButton13ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton13ActionPerformed

show += "*";

text.setText(show);

}//GEN-LAST:event_jButton13ActionPerformed

private void jButton14ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton14ActionPerformed

show += "/";

text.setText(show);

}//GEN-LAST:event_jButton14ActionPerformed

private void jButton21ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton21ActionPerformed

show = "";

text.setText("");

}//GEN-LAST:event_jButton21ActionPerformed

private void jButton22ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton22ActionPerformed

show += "=";

text.setText(show);

char str1[] = new char[50];

char str2[] = new char[50];

float result = 0;

str1 = show.toCharArray();

str2 = TranSmit(str1);

result = Count(str2);

text.setText("" + result);

show = "";

}//GEN-LAST:event_jButton22ActionPerformed

private void jButton12ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton12ActionPerformed

show += "-";

text.setText(show);

}//GEN-LAST:event_jButton12ActionPerformed

private void jButton11ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton11ActionPerformed

show += "+";

text.setText(show);

}//GEN-LAST:event_jButton11ActionPerformed

public static void main(String args[])

{

jisuanqi j = new jisuanqi();

j.setBounds(300, 300, 300, 195);

j.setVisible(true);

}

// Variables declaration - do not modify//GEN-BEGIN:variables

private javax.swing.JButton jButton1;

private javax.swing.JButton jButton10;

private javax.swing.JButton jButton11;

private javax.swing.JButton jButton12;

private javax.swing.JButton jButton13;

private javax.swing.JButton jButton14;

private javax.swing.JButton jButton2;

private javax.swing.JButton jButton21;

private javax.swing.JButton jButton22;

private javax.swing.JButton jButton3;

private javax.swing.JButton jButton4;

private javax.swing.JButton jButton5;

private javax.swing.JButton jButton6;

private javax.swing.JButton jButton7;

private javax.swing.JButton jButton8;

private javax.swing.JButton jButton9;

private javax.swing.JTextField text;

// End of variables declaration//GEN-END:variables

}

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