JAVA题库:格林模拟试题一（上）(1)
添加时间: 2007-9-22 8:14:12 作者: JAVA认证考试 阅读次数:77 来源: http://www.d9soft.com
Question 1)
Which of the following lines will compile without warning or error.
1) float f=1.3;
2) char c="a";
3) byte b=257;
4) boolean b=null;
5) int i=10;
Question 2)
What will happen if you try to compile and run the following code
public class MyClass { public static void main(String arguments[]) { amethod(arguments); } public void amethod(String[] arguments) { System.out.println(arguments); System.out.println(arguments[1]); }}1) error Can't make static reference to void amethod.
2) error method main not correct
3) error array must include parameter
4) amethod must be declared with String
Question 3)
Which of the following will compile without error
1)
import java.awt.*;package Mypackage;class Myclass {}2)
package MyPackage;import java.awt.*;class MyClass{}3)
/*This is a comment */package MyPackage;import java.awt.*;class MyClass{}Question 4)
A byte can be of what size
1) -128 to 127
2) (-2 power 8 )-1 to 2 power 8
3) -255 to 256
4)depends on the particular implementation of the Java Virtual machine
Question 5)
What will be printed out if this code is run with the following command line?
java myprog good morningpublic class myprog{
public static void main(String argv[])
{
System.out.println(argv[2]);
}
}
1) myprog
2) good
3) morning
4) Exception raised: "java.lang.ArrayIndexOutOfBoundsException: 2
Question 6)
Which of the following are keywords or reserved words in Java ?
1) if
2) then
3) goto
4) while
5) case
Question 7)
Which of the following are legal identifiers
1) 2variable
2) variable2
3) _whatavariable
4) _3_
5) $anothervar
6) #myvar
Question 8)
What will happen when you compile and run the following code?
public class MyClass{ static int i; public static void main(String argv[]){ System.out.println(i); }}1) Error Variable i may not have been initialized
2) null
3) 1
4) 0
Question 9)
What will happen if you try to compile and run the following code?
public class Q { public static void main(String argv[]){ int anar[]=new int[]{1,2,3}; System.out.println(anar[1]); }}1) 1
2) Error anar is referenced before it is initialized
3) 2
4) Error: size of array must be defined
Question 10)
What will happen if you try to compile and run the following code?
public class Q { public static void main(String argv[]){ int anar[]=new int[5]; System.out.println(anar[0]); }}1) Error: anar is referenced before it is initialized
2) null
3) 0
4) 5
Question 11)
What will be the result of attempting to compile and run the following code?
abstract class MineBase { abstract void amethod(); static int i;}public class Mine extends MineBase { public static void main(String argv[]){ int[] ar=new int[5]; for(i=0;i < ar.length;i++) System.out.println(ar[i]); }}1) a sequence of 5 0's will be printed
2) Error: ar is used before it is initialized
3) Error Mine must be declared abstract
4) IndexOutOfBoundes Error
Question 12)
What will be printed out if you attempt to compile and run the following code ?
int i=1; switch (i) { case 0: System.out.println("zero"); break; case 1: System.out.println("one"); case 2: System.out.println("two"); default: System.out.println("default"); }1) one
2) one, default
3) one, two, default
4) default
Question 13)
What will be printed out if you attempt to compile and run the following code?
int i=9;switch (i) { default: System.out.println("default"); case 0: System.out.println("zero"); break; case 1: System.out.println("one"); case 2: System.out.println("two");}1) default
2) default, zero
3) error default clause not defined
4) no output displayed
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