Java method to determine whether strings are not equal

1. Determine whether the addresses are equal. Use: ==

The Object class is the super class of all classes, and the equals method of the Object class directly compares addresses. Source code As follows:

public boolean equals(Object obj)  
   {  
       return this == obj;  
   }

2. Determine whether the values ​​are equal. Use: equals method

equals() method is used to compare a string with a specified object.

Syntax

public boolean equals(Object anObject)

Parameters

anObject -- The object to compare with the string.

Return value

Returns true if the given object is equal to the string; otherwise returns false.

public class Test {
    public static void main(String args[]) {
        String Str1 = new String("runoob");
        String Str2 = Str1;
        String Str3 = new String("runoob");
        boolean retVal;
        retVal = Str1.equals( Str2 );
        System.out.println("返回值 = " + retVal );
        retVal = Str1.equals( Str3 );
        System.out.println("返回值 = " + retVal );
    }
}

The execution result of the above program is:

Return value = true

Return value = true

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