Java Object equals(Object obj)用法及代码示例

equals(Object obj) 是 Object 类的方法。此方法用于比较给定的对象。建议重写 equals(Object obj) 方法以获得我们自己的对象相等条件。

用法

public boolean equals(Object obj)

参数

obj- 它是参考对象。

如果此对象与 obj 参数相同，则返回 true，否则返回 false。

例子1

public class JavaObjectequalsExample1 {
   static int a = 10, b=20;  
    int c; 
    // Constructor 
    JavaObjectequalsExample1() 
    { 
        System.out.println("Addition of 10 and 20:");
        c=a+b;
        System.out.println("Answer:"+c);        
    } 
  
    // Driver code 
    public static void main(String args[]) 
    { 
        System.out.println("1st object created...");
        JavaObjectequalsExample1 obj1 = new JavaObjectequalsExample1();  
        System.out.println("2nd object created...");
        JavaObjectequalsExample1 obj2 = new JavaObjectequalsExample1();  
        System.out.println("Objects are equal:" + obj1.equals(obj2)); 
    }  
}

输出：

1st object created...
Addition of 10 and 20:
Answer:30
2nd object created...
Addition of 10 and 20:
Answer:30
Objects are equal:false

例子2

public class JavaObjectequalsExample2{
   static int a = 10, b=20;  
    int c; 
    // Constructor 
    JavaObjectequalsExample2() 
    { 
        System.out.println("Addition of 10 and 20:");
        c=a+b;
        System.out.println("Answer:"+c);        
    } 
    JavaObjectequalsExample2(int x, int y) 
    { 
        System.out.println("Parameterized Constructors");
        System.out.println("Addition " +x+ " and " +y);
        c=x+y;
        System.out.println("Answer:"+c);        
    } 
    // Driver code 
    public static void main(String args[]) 
    { 
        System.out.println("1st object created...");
        JavaObjectequalsExample2 obj1 = new JavaObjectequalsExample2();  
        System.out.println("2nd object created...");
        JavaObjectequalsExample2 obj2 = new JavaObjectequalsExample2(2,3);  
        System.out.println("Objects are equal:" + obj1.equals(obj2)); 
    }  
}

输出：

1st object created...
Addition of 10 and 20:
Answer:30
2nd object created...
Parameterized Constructors
Addition 2 and 3
Answer:5
Objects are equal:false

相关用法

注：本文由纯净天空筛选整理自 Java Object equals(Object obj) Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。