Java Double isInfinite() 方法

2024 年 11 月 10 日 | 阅读 2 分钟

Java Double 类的 isInfinite() 方法在参数的绝对值是无穷大时返回 true，否则返回 false。

语法

1.public boolean isInfinite()
2.public static boolean isInfinite(double v)

参数

1.无

2.v- 要被测试的双精度值。

返回值

isInfnite() 方法在传递的参数值为正无穷大/负无穷大时返回 true，否则返回 false。

示例 1

public class Double_isInfiniteMethodExample1 {

    public static void main(String[] args) {

        double d1 = 578648.67f;

        Double d2 = new Double(d1/0);

           //isInfinite will return true for infinity values

        System.out.println(d2+" value for isInfinite() method is : " +Double.isInfinite(d2));

           //isFinite method will return false as f1/0 is infinity

        System.out.println(d2+" value for isFinite() method is   : "+Double.isInfinite(d2));

         }

    }

输出

Infinity value for isInfinite() method is : true
Infinity value for isFinite() method is   : false

示例 2

public class Double_isInfiniteMethodExample2 {

    public static void main(String[] args) {

        // will return false

        Double d1 = new Double(0X7f800000);

        System.out.println("1. "+d1+" value = " + Double.isInfinite(d1));

        //will return false

        Double d2 = new Double(76E-43);

        System.out.println("2. "+d2+" value = " + Double.isInfinite(d2));

        //will return false for NaN

        Double d3 = new Double(0.0/0.0);

        System.out.println("3. "+d3+" value = "+Double.isInfinite(d3));

        //will return true for negative infinity

        Double d4 = new Double(-3723.93/0.0);

        System.out.println("4. "+d4+" value = "+Double.isInfinite(d4));

    }

}

输出

1. 2.13909504E9 value = false
2. 7.6E-42 value = false
3. NaN value = false
4. -Infinity value = true

示例 3

public class Double_isInfiniteMethodExample3 {

    public static void main(String[] args) {

        Double d1 = new Double(76434763746.82468746746874827);

        //static isInfinite() method

        boolean b1=Double.isInfinite(d1);

        System.out.println("1. "+d1+" value = "+b1);

        double d2 = 27.827;

        //also be called inside println function

        System.out.println("2. "+d2+" value = "+Double.isInfinite(d2));

        double d3= Double.POSITIVE_INFINITY;

        System.out.println("3. "+d3+ " value = " +Double.isInfinite(d3));

        double d4= Double.NEGATIVE_INFINITY;

        System.out.println("4. "+d4+ " value = " +Double.isInfinite(d4));

        double d5=Double.NaN;

        System.out.println("5. "+d5+ " value = " +Double.isInfinite(d5));

    }

}

输出

1. 7.643476374682469E10 value = false
2. 27.827 value = false
3. Infinity value = true
4. -Infinity value = true
5. NaN value = false

下一个主题Java-double-isnan-method

Java Double isInfinite() 方法

语法

参数

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示例 1

示例 2

示例 3

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Java Double isInfinite() 方法

语法

参数

返回值

示例 1

示例 2

示例 3

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