Java Double longValue() 方法

2024 年 11 月 10 日 | 阅读 2 分钟

Java Double 类的 longValue() 方法通过缩小原始值或转换为 long 类型，返回此对象的 long 值。

语法

参数

不适用

返回值

longValue() 方法返回此 Double 对应的 double 值，该值已被转换为 long 类型。

示例 1

public class Double_longValueMethodExample1{
    public static void main(String[] args) {
        double d1 = 655;
        Double d2 = new Double(d1);
        // return the long value of double object
        Long val1 = d2.longValue();
        System.out.println("1. "+"Long value for "+d1+" = "+val1);

        Double d3 = new Double(6575876985679.675);
        System.out.println("2. "+"Long value for "+d3+" = "+d3.longValue());
        //passing negative integer
        Double d4 = new Double(-86776985679.88675);
        System.out.println("3. "+"Long value for "+d4+" = "+d4.longValue());
    }
}

输出

1. Long value for 655.0 = 655
2. Long value for 6.575876985679675E12 = 6575876985679
3. Long value for -8.677698567988675E10 = -86776985679

示例 2

import java.util.Scanner;

public class Double_longValueMethodExample2 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter three numbers");
        System.out.print("1.");     Double d1 =scanner.nextDouble();
        System.out.print("2.");     Double d2 =scanner.nextDouble();
        System.out.print("3.");     Double d3 =scanner.nextDouble();
        //adding the long values
        Long val1= d1.longValue()+d2.longValue()+d3.longValue();
        System.out.println("1.Sum:     "+d1.longValue()+"+"+d2.longValue()+"+"+d3.longValue()+" = "+ val1);
        //
        Long val2= d1.longValue()*d2.longValue()*d3.longValue();
        System.out.println("1.Mul:     "+d1.longValue()+"*"+d2.longValue()+"*"+d3.longValue()+" = "+ val2);

    }
}

输出

Enter three numbers
1.56.7568
2.422.087775
3.0.456454
1.Sum:     56+422+0 = 478
1.Mul:     56*422*0 = 0

示例 3

import java.util.Scanner;

public class Double_longValueMethodExample3 {
    public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
        System.out.println("Enter your annual income");
        Double d1 = scanner.nextDouble();
        Long val1 = d1.longValue() / 12;

         if (val1 < 30000 ) {
            Long l1= val1 + 2000;
            System.out.println("You got an increment of 5000.\nYour new monthly salary is:" +l1);
        }
        else if (val1 >30000 && val1< 80000) {
            Long l1= val1 + 5000;
            System.out.println("You got an increment of 5000.\nYour new monthly salary is:" +l1);
        } else if (val1 > 80000 && val1<100000) {
            Long l2= val1 + 8000;
            System.out.println("You got an increment of 8000.\nYour new monthly salary is:" + l2);
        } else {
            Long l3= val1 + 15000;
            System.out.println("You got an increment of 15000.\nYour new monthly salary is:" + l3);
        }
    }
}

输出

Enter your annual income
486674.4553
You got an increment of 5000.
Your new monthly salary is:45556

下一主题Java-double-max-method

Java Double longValue() 方法

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Java Double longValue() 方法

语法

参数

返回值

示例 1

示例 2

示例 3

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