Java之对象引用static变量

如下面代码

Java代码

public class Test

{

public static int a = 2;

public static void main(String[] args)

{

Test t = new Test();

t = null;

System.out.println(t.a);

}

}

输出为：

2

下面的代码

Java代码

public class Test

{

public static int a = 2;

public int b = 3;

public static void main(String[] args)

{

Test t = new Test();

t = null;

System.out.println(t.a);

System.out.println(t.b);

}

}

输出为：

2

Exception in thread "main" java.lang.NullPointerException

再看下面的代码：

Java代码

public class Test

{

public int a = 3;

public static int b = 2;

public static void main(String[] args)

{

Test t = new Test();

t = null;

System.out.println(t.a);

System.out.println(t.b);

}

}

输出为：

Exception in thread "main" java.lang.NullPointerException