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Mock Exam - Arrays

Q1	Which of the following are valid array construction?
A1	int a[] = new int[];
A2	int a[] = new int[10];
A3	int a[10] = new int[];
A4	int a[] = new a[10];

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Q2	Which of the following are valid array initialization?
A1	new int[] = {1,2,3,4};
A2	new int[10] = {1,2,3,4};
A3	new int[] = 1,2,3,4;
A4	new int[] = [1,2,3,4];

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Q3	public class Test3{     public static void main(String args[]){          int arr[] = new int[10];          int i = 5;          arr[i++] = ++i+i++;          System.out.print(arr[5]+":"+arr[6]);      } } What will be the output?
A1	14:0
A2	0:14
A3	0:0
A4	Compiler Error

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Q4	public class Test4{      public static void main(String args[]){           int arr[] = new int[10];           int i = 5;           arr[i++] = i+++i++;           System.out.print(arr[5]+":"+arr[6]);      } } What will be the output?
A1	13:0
A2	14:0
A3	0:14
A4	0:13

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Q5	public class Test5{     static Boolean bl[] = new Boolean[5];     public static void main(String args[]){          System.out.println(bl[0]);     } } What will be the output?
A1	null
A2	false
A3	true
A4	Compiler Error

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Q6	Which of the following are valid array declarations?
A1	String[][] a1 = String[20][20];
A2	String[][] a2 = new String[20,20];
A3	String[][] a3 = new String[20][20];
A4	String a4[][] = new String[20][20];
A5	String[] a5[] = new String[20][20];

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Q7	Which of the following code correctly creates an array of four initialized string objects?.
A1	String players[] = new String[4];
A2	String players[] = {"","","",""};
A3	String players[]; players = new String[4];
A4	None of the above.

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Q8	char[] c = new char[100]; what is the value of c[50]?
A1	50
A2	49
A3	'\u0000'
A4	'\u0020'

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Q9	which of the following are valid arrays?
A1	new float[10]={1,2};
A2	new float[]={1,2};
A3	new float={1,2};
A4	none of the above

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Q10	public class Test10{     public void method(int arr[]){         arr[0] = 10;     }     public static void main(String[] args){         int[] small = {1,2,3};         Test10 t= new Test10();         t.method(small);         System.out.println(small[0]);     } }  what will be the output?
A1	0
A2	1
A3	0
A4	none of the above

Answers

1	A2)int a[] = new int[10];
2	A1)new int[] = {1,2,3,4};
3	A1)14:0
4	A1)13:0
5	A1)null
6	A3 : String[][] a3 = new String[20][20]; A4 : String a4[][] = new String[20][20]; A5 : String[] a5[] = new String[20][20];
7	A2 : String players[] = {"","","",""};
8	c) '\u0000'
9	b)new float[]={1,2};
10	10

400 Mock Questions on OCPJP 6 (formerly known as SCJP 1.6) JUST Rs.300 or 10 USD Send us mail to sales@javabeat.net more details