英文北京东方国信java面试

1、1Part （每题（每题 1 1 分）分）1)Which of the following lines will compile without warning or error? Select all valid answers. a ea) float f=0; b) char c=“0“; c) byte b=157; d) boolean f=null; e) int i=10; 2)What are the valid types for the given variable i ? cpublic class Base private void test() / i = 1; switch (i) static public void main(String a) new Base().test(); Select most appropriate answer. a) char, int b) boolean, byte, char, short, int c) byte, char, short, int d) byte, char, short, int, long

2、e) Only int3)What is the correct way of declarating main() so that the progarm can be compiled and executed using this entry point. abcfa) static public void main(String args) b) static public void main(String a) c) public static void main(String a) d) static void public main(String a) e) public void main(String a) f) static public void main(char arg)24)What will be output if the program is executed as belowjava -DOne -DTwo -DThree Sample public class Sample public static void main(String argv)

3、System.out.println(argv2) Select most appropriate answer. b a) One b) Two c) Three d) Exception raised: “java.lang.ArrayIndexOutOfBoundsException: 2“ e) NonePart （每题（每题 1 1 分）分）5)Abstract method cannot be static. True or False ? truea) True b) False6)What will be the output when you compile and execute the following program. d/ class Base void test() System.out.println(“Base.test()“); / public class Child extends Base void test() System.out.println(“Child.test()“); static public void main(String

4、 a) Child anObj = new Child(); Base baseObj = (Base)anObj;3/Base b=new Child(); /b.test(); baseObj.test(); Select most appropriate answer. a) Child.test() Base.test() b) Base.test() Child.test() c) Base.test() d) Child.test()7)What will be the output when you compile and execute the following program. C / class Base static void test() System.out.println(“Base.test()“); / public class Child extends Base void test() System.out.println(“Child.test()“); Base.test(); /Call the parent method static pu

5、blic void main(String a) new Child().test(); Select most appropriate answer. a) Child.test() Base.test() b) Child.test() Child.test() c) Compilation error. Cannot override a static method by an instance method d) Runtime error. Cannot override a static method by an instance method48)What will be the output when you compile and execute the following program. Exception is the base class for all the Exception classes. / import java.io.*;class Base void test() throws IOException System.out.println(“

6、Base.test()“); String a = null;/Complex logic goes here if(a = null) throw new IOException(“); / public class Child extends Base protected void test() throws Exception System.out.println(“Child.test()“); throw new Exception(“); static public void main(String a) try new Child().test(); catch(Exception e) Select most appropriate answer. ba) Child.test() Base.test() b) Compilation Error: The method void test() declared in class Child cannot override the method of the same signature declared in clas

7、s Base. Their throws clauses are incompatible. c) Compilation Error: The method void test() declared in class Child cannot override the method of the same signature declared in class Base. The access modifier is made more restrictive. d) Runtime error. Cannot make the access modifier more restrictive for test() 5PartPart （每题（每题 1 1 分）分）9)What will be the output when you compile and execute the following program. bpublic class Base private void test() System.out.println(6 + 6 + “(Result)“); stati

8、c public void main(String a) new Base().test(); Select most appropriate answer. a) 66(Result) b) 12(Result) c) Runtime Error.Incompatible type for +. Cant convert an int to a string. d) Compilation Error.Incompatible type for +. Cant add a string to an int.10) What will be the output when you compile and execute the following program. The symbol means space. e 1:public class Base 2: 3: private void test() 4: 5: String aStr = “One“;6: String bStr = aStr; 7: aStr.toUpperCase(); 8: aStr.trim(); 9: System.out.println(“ + aStr + “,“ + bStr + “); 7: 8: 9: static public void main(String a) 10: new Base().test(); 11: 12: Select most appropriate answer.6a) ONE,One b) One,One c) ONE,One d) ONE,ONE e) One,One 11) What will be the output when you compile and execute the following program. dpublic class Base void test() String aStr = “OneString“; System.out.println(aStr.substring(3,7); static public void main(String a) n

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