java关系操作符(==、!=)和equals()实例讲解

//:  /test.java

package  ;
import java.util.*;

public class Test{
    public static void main(String[] args)
    {
        Integer n1 = new Integer(47);
        Integer n2 = new Integer(47);
        System.out.println(n1 == n2);//output false
        System.out.println(n1 != n2);//output true
    }
}
//比较的是对象的引用

//:  /test.java

package  ;
import java.util.*;

public class Test{
    public static void main(String[] args)
    {
        int n1 = 100;
        int n2 = 100;
        System.out.println(n1==n2);//output false
    }
}

//:  /test.java

package  ;
import java.util.*;

public class Test{
    public static void main(String[] args)
    {
        Integer n1 = new Integer(47);
        Integer n2 = new Integer(47);
        System.out.println(n1.equals(n2));//output true
    }
}

//:  /test.java

package  ;
import java.util.*;

class Value{
    int i;
}

public class Test{
    public static void main(String[] args)
    {
        Value n1 = new Value();
        Value n2 = new Value();
        n1.i = n2.i = 100;
        System.out.println(n1.equals(n2));//output false
    }
}