系统类identityHashCode()方法 (System class identityHashCode() method)

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

  identityHashCode()方法在java.lang包中可用。

• identityHashCode() method is used to return the hashcode of the given object – By using this method the value of hashcode will be the same as the value of hashcode by using hashCode() method.

  identityHashCode()方法用于返回给定对象的哈希码–通过使用此方法，哈希码的值将与使用hashCode()方法的哈希码的值相同。

• Let suppose, if we pass an object that holds null value then in that case, the value of hashCode will be 0.

  假设，如果我们传递一个持有null值的对象，则在这种情况下，hashCode的值将为0 。

• identityHashCode() method is a static method so this method is accessible with the class name too.

  identityHashCode()方法是静态方法，因此也可以使用类名访问此方法。

• identityHashCode() method does not throw any exception.

  identityHashCode()方法不会引发任何异常。

Syntax:

句法：

public static int identityHashCode(Object obj);

Parameter(s):

参数：

• obj – represent the object for which the hashcode is to be returned.

  obj –代表要为其返回哈希码的对象。

Return value:

返回值：

The return type of this method is int, it returns the hashcode of the given argument.

此方法的返回类型为int ，它返回给定参数的哈希码。

Example:

例：

// Java program to demonstrate the example of // identityHashCode () method of System Classimport java.lang.*;import java.io.*;public class IdentityHashCodeMethod {
       public static void main(String[] args) throws Exception {
           File file1 = new File("Java");        File file2 = new File("Programming");        // getting hashcode        int hcode1 = System.identityHashCode(file1);        System.out.println(hcode1);        // getting hashcode        int hcode2 = System.identityHashCode(file2);        System.out.println(hcode2);            }}

Output

输出量

E:\Programs>javac IdentityHashCodeMethod.javaE:\Programs>java IdentityHashCodeMethod1018081122242131142

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