GD:惠普Java类笔试题.doc

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GD:惠普Java类笔试题

JAVA部分 1.which are run-time exceptions() a,d,f,g,h A.ArithmeticException B.ClassNotFoundException C.OutOfMemoryError D.ClassCastException E.InterruptedException F.IllegalArgumentException G.IndexOutOfBoundsException H.NullPointException 2.Which Man class properly represents the relationship Man has a best friend who is a Dog d A.class Man extends Dog{} B.class Man implements{} C.class Man{private BestFriend dog;} D.class Man{private Dog bestFriend;} E.class Man{private Dog;} F.class Man{private BestFriend;} 3 Given: b,c,f interface Jumper{public void jump();} class Animal{}.. class Dog extends Animal{Tail tail;} class Beagle extends Dog implements Jumper{public void jump(){}}.. class Cat implements Jumper(public void jump(){}} Which are true( ) Multiple choices A.Cat is-a Aminal B.Cat is-a Jumper C.Dog is-a Animal D.Dog is-a Jumper E.Cat has-a Animal F.Beagle has-a Tail H.Beagle has-a Jumper 4 Given: a,b,c,d,e interface A{public int getValue();} class B implements A{public int getValue(){return 1;}} class C extends B{ 15 :insert code in here} Which three code frgments,inserted individaully at line 15,make use (多选) A:public void add(C c){c.getValue();} B:public void add(B b){b.getValue();} C:public void add(A a){a.getValue();} D:public void add(A a,B b){a.getValue();} E:public void add(C c1,C c2){c1.getValue();} 5.丢失 6.Given B [2P] String test = This is test; String[] tokens = test.split(¥s); System.out.println(tokens.length); whta is the result( ) A.0 B.1 C.4 D.Compilation fails E.An exception is thrown at runtime 7. Given: C class Wow{ public static void go(short n){ System.out.print(short); } public static void go(Short n){ System.out.print(SHORT); } public static void go(Long n){ System.out.print(LONG); } public static void main(String[] args){ Short n = 6; int m = 7; go(n); go(m);//这一句编译出错 } } Which is th result? ( ) [2P] A. short LONG B. SHORT LONG C. Compilation fails D.An exception is thrown

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