Java Double compare()方法及实例

Double类 的 compare() 方法是Java中的一个内置方法，用于比较两个指定的双倍值。返回的整数值的符号与函数调用所返回的整数值的符号相同。

语法

public static int compare(double d1, double d2)

参数： 该函数接受两个参数。

返回值： 该函数的返回值如下。

以下程序说明了Double.compare()函数的使用。

程序1： 当两个整数相同时

// Java Program to illustrate// the Double.compare() method import java.lang.Double; public class GFG {    public static void main(String[] args)    {         // Get the two double values        // to be compared        Double d1 = 1023d;        Double d2 = 1023d;         // function call to compare two double values        if (Double.compare(d1, d2) == 0) {             System.out.println("d1=d2");        }        else if (Double.compare(d1, d2) < 0) {             System.out.println("d1<d2");        }        else {             System.out.println("d1>d2");        }    }}

输出

d1=d2

程序2： 当d1<d2

// Java Program to illustrate// the Double.compare() method import java.lang.Double; public class GFG {    public static void main(String[] args)    {         // Get the two double values        // to be compared        Double d1 = 10d;        Double d2 = 1023d;         // function call to compare two double values        if (Double.compare(d1, d2) == 0) {             System.out.println("d1=d2");        }        else if (Double.compare(d1, d2) < 0) {             System.out.println("d1<d2");        }        else {             System.out.println("d1>d2");        }    }}

输出

d1

程序3： 当d1>d2时

// Java Program to illustrate// the Double.compare() method import java.lang.Double; public class GFG {    public static void main(String[] args)    {         // Get the two double values        // to be compared        Double d1 = 1023d;        Double d2 = 10d;         // function call to compare two double values        if (Double.compare(d1, d2) == 0) {             System.out.println("d1=d2");        }        else if (Double.compare(d1, d2) < 0) {             System.out.println("d1<d2");        }        else {             System.out.println("d1>d2");        }    }}

输出

d1>d2

参考 : https://docs.oracle.com/javase/7/docs/api/java/lang/Double.html#compare(double, %20double)