简短的类compareTo()方法 (Short class compareTo() method)

• compareTo() method is available in java.lang package.

  compareTo()方法在java.lang包中可用。

• compareTo() method is used to check equality or inequality for this Byte object against the given Byte object mathematically or in other words, we can say this method is used to compare two Byte objects.

  compareTo()方法用于在数学上检查此Byte对象与给定Byte对象的相等性或不相等性，换句话说，可以说此方法用于比较两个Byte对象。

• compareTo() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  compareTo()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• compareTo() method does not throw an exception at the time of comparing Byte object.

  在比较Byte对象时， compareTo()方法不会引发异常。

Syntax:

句法：

public int compareTo(Byte value2);

Parameter(s):

参数：

• Byte value2 – represents the Byte object to compare with.

  字节值2 –表示要比较的字节对象。

Return value:

返回值：

The return type of this method is int, it returns an integer value based on the following cases,

此方法的返回类型为int ，它基于以下情况返回整数值：

• It returns 0, if value1 is mathematically equal to value2.

  如果value1在数学上等于value2 ，则返回0 。

• It returns the value < 0, if value1 is mathematically less than value2.

  如果value1在数学上小于value2 ，则返回值<0 。

• It returns the value > 0, if value1 is mathematically greater than value2.

  如果value1在数学上大于value2 ，则返回值> 0 。

Example:

例：

// Java program to demonstrate the example // of compareTo(Byte value2) method of Byte classpublic class CompareToOfByteClass {
       public static void main(String[] args) {
           // Variables initialization        byte b1 = 10;        byte b2 = 20;        // Byte instance         Byte value1 = new Byte(b1);        Byte value2 = new Byte(b2);        // It compare two Byte objects and placed the result         // in another variable (compare) of integer type        int compare = value1.compareTo(value2);        // Display result        System.out.println("value1.compareTo(value2): " + compare);        System.out.println();        if (compare == 0)            System.out.println("value1 is equal to value2");        else if (compare < 0)            System.out.println("value1 is less than value2");        else            System.out.println("value1 is greater than value2");    }}

Output

输出量

value1.compareTo(value2): -10value1 is less than value2

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