java基础之"=="操作符

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java 综合

Java

Java代码
public class Test
{
    public static void main(String[] args)
    {
        Test t = new Test();

        t.compare();
        t.compare2();
    }

    public void compare()
    {
        //1
        Integer i1 = new Integer(1);
        Integer i2 = new Integer(1);
        Integer i3 = i1;

        System.out.println(i1 == i2);
        System.out.println(i1 == i3);
        System.out.println(i1.equals(i2));
        System.out.println();

        //2
        Boolean b1 = new Boolean(false);
        Boolean b2 = new Boolean(false);
        Boolean b3 = b1;

        System.out.println(b1 == b2);
        System.out.println(b1 == b3);
        System.out.println(b1.equals(b2));
        System.out.println();

        //3
        int[] a1 = new int[3];
        int[] a2 = new int[3];
        int[] a3 = a1;

        System.out.println(a1 == a2);
        System.out.println(a1 == a3);
        System.out.println(a1.equals(a2));
        System.out.println();
    }

    public void compare2()
    {
        TestC tc = new TestC();
        TestB tb = new TestB();
        TestA ta = new TestA();

        System.out.println(tc == tb);
        System.out.println(tc == ta);

        ta = tb;
        System.out.println(ta == tb);

        ta = tc;
        System.out.println(ta == tc);

        ta = new TestC();
        System.out.println(ta == tc);
    }
}

class TestC extends TestB
{

}

class TestB extends TestA
{

}

class TestA
{

}

public class Test
{
public static void main(String[] args)
{
Test t = new Test();

t.compare();
t.compare2();
}

public void compare()
{
//1
Integer i1 = new Integer(1);
Integer i2 = new Integer(1);
Integer i3 = i1;

System.out.println(i1 == i2);
System.out.println(i1 == i3);
System.out.println(i1.equals(i2));
System.out.println();

//2
Boolean b1 = new Boolean(false);
Boolean b2 = new Boolean(false);
Boolean b3 = b1;

System.out.println(b1 == b2);
System.out.println(b1 == b3);
System.out.println(b1.equals(b2));
System.out.println();

//3
int[] a1 = new int[3];
int[] a2 = new int[3];
int[] a3 = a1;

System.out.println(a1 == a2);
System.out.println(a1 == a3);
System.out.println(a1.equals(a2));
System.out.println();
}

public void compare2()
{
TestC tc = new TestC();
TestB tb = new TestB();
TestA ta = new TestA();

System.out.println(tc == tb);
System.out.println(tc == ta);

ta = tb;
System.out.println(ta == tb);

ta = tc;
System.out.println(ta == tc);

ta = new TestC();
System.out.println(ta == tc);
}
}

class TestC extends TestB
{

}

class TestB extends TestA
{

}

class TestA
{

}

输出为：

Java代码
false
true
true

false
true
true

false
true
false

false
false
true
true
false

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java 之动态绑定和静态绑定 | java 内部类测试

2010-11-26 21:16
浏览 621
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