举一反三
- 从下面四段代码中选择出正确的代码段（） A: public class Something {public static void main(String[] args) {Other o = new Other();new Something().addOne(o);}public void addOne(final Other o) {o.i++;}}class Other {public int i;} B: public class Something {void doSomething () {private String s = ̶”;int l = s.length();}} C: abstract class Name {private String name;public abstract boolean isStupidName(String name) {}} D: public class Something {public int addOne(final int x) {return ++x; }}
- 从下面四段（A，B，C，D）代码中选择出正确的代码段 A: abstract class Name { private String name; public abstract boolean isStupidName(String name) {} } B: public class Something { void doSomething () { private String s = ""; int l = s.length(); } } C: public class Something { public static void main(String[] args) { Other o = new Other(); new Something().addOne(o); } public void addOne(final Other o) { o.i++; } } class Other { public int i; } D: public class Something { public int addOne(final int x) { return ++x; } }
- 读代码: public class Test { public static void main (String args[]) { class Foo { public int i = 3; } Object o = (Object) new Foo(); Foo foo = (Foo)o; System.out.println(foo.i); } } 结果是：
- abstract class BaseClass { public virtual void MethodA() { } public virtual void MethodB() { } } class Class1: BaseClass { public void MethodA(string arg){ } public override void MethodB(){ } } class Class2: Class1 { new public void MethodB(){ } } class MainClass { public static void Main(string[] args) { Class2 o = new Class2(); Console.WriteLine(o.MethodA()); } } 请问，o.MethodA调用的是 A: BaseClass.MethodA B: Class2.MethodA C: Class1.MethodA D: 都不是
- 下列代码的执行结果是 。public class Test {public int aMethod(){static int i=0;i++;System.out.println(i);}public static void main(String args[ ]){Test test = new Test();test.aMethod();}}
内容
- 0
有如下代码，则该程序运行时输出结果是。 class Test{ static int i=0; public void show() { i++; System.out.println(i); } } public class Demo { public static void main(String[] args) { Test test=new Test(); test.show(); } }
- 1
以下程序编译和运行会发生什么public class Q8 {int i = 20;static { int i = 10; }public static void main(String[] args) {Q8 a = new Q8();System.out.println(a.i);}}
- 2
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(); } }
- 3
public class Example { public static void main(String[] args) { new Father () { public void show() { System.out.println("helloworld"); } }.show(); } } class Father { public void show() { System.out.println("hellofather"); } }
- 4
（7-1）以下程序的运行结果是（ ）。 class A{ A(){ System.out.print(10); } } public class Demo extends A { public static void main(String[] args) { new A(); new Demo(); } }