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1.创建一个Arithmetic类

public class Arithmetic {

//整数加法
public int add(int a, int b) {
return a+b;
}

//整数减法
public int subtract(int a, int b) {
return a-b;
}

//整数乘法
public int multiply(int a, int b) {
return a*b;
}

//整数除法
public int divide(int a, int b) {
return a/b;
}

//浮点数加法
public double add(double a, double b) {
return a+b;
}

//浮点数减法
public double subtract(double a, double b) {
return a-b;
}

//浮点数乘法
public double multiply(double a, double b) {
return a*b;
}

//浮点数除法
public double divide(double a, double b) {
return a/b;
}

//整数加法，多参数
public int add(int... nums) {
int sum = 0;
for(int num : nums) {
sum += num;
}
return sum;
}

//浮点数加法，多参数
public double add(double... nums) {
double sum = 0;
for(double num : nums) {
sum += num;
}
return sum;
}

}

2.测试类

public class TestArithmetic {

public static void main(String[] args) {

Arithmetic arithmetic = new Arithmetic();

//整数加法
System.out.println(arithmetic.add(1, 2));

//整数减法
System.out.println(arithmetic.subtract(2, 1));

//整数乘法
System.out.println(arithmetic.multiply(2, 3));

//整数除法
System.out.println(arithmetic.divide(6, 2));

//浮点数加法
System.out.println(arithmetic.add(1.2, 2.3));

//浮点数减法
System.out.println(arithmetic.subtract(2.3, 1.2));

//浮点数乘法
System.out.println(arithmetic.multiply(2.0, 3.0));

//浮点数除法
System.out.println(arithmetic.divide(6.0, 2.0));

//整数加法，多参数
System.out.println(arithmetic.add(1, 2, 3));

//浮点数加法，多参数
System.out.println(arithmetic.add(1.2, 2.3, 3.4));

}

}