java的equals方法

长类equals()方法 (Long class equals() method)

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

  equals()方法在java.lang包中可用。

• equals() method is used to check equality or inequality of this Object against the given Object or in other words we can say this method is used to compare two objects.

  equals()方法用于检查该对象与给定对象的相等性或不相等性，换句话说，我们可以说该方法用于比较两个对象。

• equals() 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.

  equals()方法是一种非静态方法，仅可通过类对象访问，如果尝试使用类名访问该方法，则会收到错误消息。

• equals() method does not throw an exception at the time of comparing two Objects.

  在比较两个对象时， equals()方法不会引发异常。

Syntax:

句法：

public boolean equals(Object ob);

Parameter(s):

参数：

• Object ob – represents the Object to compare with.

  对象ob –表示要比较的对象。

Return value:

返回值：

The return type of this method is boolean, it returns true if Object1 is equal to Object2, else it returns false.

此方法的返回类型为boolean ，如果Object1等于Object2 ，则返回true，否则返回false。

Example:

例：

// Java program to demonstrate the example // of boolean equals(Object o) method of Long classpublic class EqualsOfLongClass {
       public static void main(String[] args) {
           // Long Object initialization        Long ob1 = new Long(10);        Long ob2 = new Long(20);        // Display ob1,ob2 values        System.out.println("ob1: " + ob1);        System.out.println("ob2: " + ob2);        // It compare two objects of Long type        // by calling ob1.equals(ob2)        boolean compare = ob1.equals(ob2);        // Display result values        System.out.println("ob1.equals(ob2): " + compare);        if (compare == true)            System.out.println("Both objects are equal");        else            System.out.println("Both objects are not equal");    }}

Output

输出量

ob1: 10ob2: 20ob1.equals(ob2): falseBoth objects are not equal

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java的equals方法