题目内容

int x, b=0; for(x = 0; x <= 5; ++x){ if (x == 2) break; ++b; }

A. 0
B. 1
C. 2
D. 3

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给出以下程序:1. public class Electronic implements Device2.{ public void doIt() { } }3. abstract class Phone1 extends Electronic { }5. abstract class Phone2 extends Electronic6.{ public void doIt(int x) { } }7. class Phone3 extends Electronic implements Device8.{ public void doStuff() { } }9. interface Device { public void doIt(); }程序输出结果为?()

A. Compilation succeeds
B. Compilation fails with an error on line 1
Compilation fails with an error on line 3
D. Compilation fails with an error on line 5

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给出下面的代码()class Person{String name,department;public void printValue(){System.out.println("name is"+name);}}public class Teacher extends Person{int salary;public void printValue(){_______________________System.out.println("salary is"+ salary);}}}下面的哪个表达式可以加入到Teacher类的printValue()方法中.

A. printValue();
B. this.printValue();
C. person.printValue();
D. super.printValue(D);

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以下哪个事件表示按下java.awt.Component键?()

A. KeyEvent
B. KeyDownEvent
C. KeyPressEvent
D. KeyTypedEvent
E. KeyPressedEvent

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Test类中合法的构造函数是()

A. test() { }
B. Test() { }
C. void Test() { }
D. private final Test() { }

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int x, b=0; for(x = 0; x <= 5; ++x){ if (x == 2) break; ++b; }

A. 0 B. 1 C. 2 D. 3

以下哪个事件表示按下java.awt.Component键?()

Test类中合法的构造函数是()

A. 0
B. 1
C. 2
D. 3