public class Demo{
private int data;
public Demo(){
data=0;
}
public void show(){
System.out.println("data="+data);
}
protected void finalize() throws Throwable{
System.out.println("data is "+data);
super.finalize();
}
public static void main(String[] arge){
}
}
data Demo finalize;finalize()
举一反三
- 下列程序运行结果是( ) public class Demo { public static void main(String[] args) { Demo demo = new Demo(); demo.show(new Car() { public void run() { System.out.println("demo run"); } }); } public void show(Car c) { c.run(); } }abstract class Car { public void run() { System.out.println("car run..."); } }
- 在Demo类中 public class Demo{ public Demo(){} public void Demo(int x){} } 构造方法Demo重载了
- 下列程序运行结果是 public class Demo { public static void main(String[] args) { Object obj=new Father(){ public void show(){ System.out.println("helloworld"); } }; obj.show(); } } class Father{ public void show(){ System.out.println("hello father"); } }
- 下列ABCD注释标注的哪行代码有错public class Demo { public static void main(String args[]) { System.out.println("Java"); system.out.println("hello"); System.out.println("你好"); } } A: public class Demo B: public static void main(String args[]) C: system.out.println("ok"); D: System.out.println("您好");
- 下列程序的执行结果是 public class TestDemo { public void fun() { static int i = 0; i++; System.out.println(i); } public static void main(String args[]) { Demo d = new Demo(); d.fun(); } }
内容
- 0
下列程序的运行结果是（ ）class Demo{private String name;Demo(String name){this.name = name;}private static void show(){System.out.println(name)}public static void main(String[] args){Demo d = new Demo(“lisa”);d.show();}}
- 1
中国大学MOOC: 下列代码中构造方法的返回类型是（）public class Village { Village () { System .out .println(“hiding in Village”) ; } public static void main( String args [ ]) { Village c =new Village ( ) ;}class Village { public static void main( String args [ ]) { Village c =new Village ( ) ; } Village () { System .out .println(“hiding in Village”) ; } }
- 2
public class Demo { public Demo(){} public void Demo(int x){} } 上述代码中的构造方法Demo重载了
- 3
下列程序运行结果是（ ） public class Demo { public static void main(String[] args) { Object obj=new Father(){ public void show(){ System.out.println("helloworld"); } }; obj.show(); } } class Father{ public void show(){ System.out.println("hello father"); } }
- 4
（2-5）写出下面程序运行结果。 public class Demo { public static void main(String args[]) { System.out.println(123); System.out.println(0123); System.out.println(0x123); } }