Mock java Questions set - 17

Sun Certified Java Programmer(SCJP 1.4)
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];
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];
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
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
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
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];
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.
Q8
char[] c = new char[100];
what is the value of c[50]?
A1 50
A2 49
A3 '\u0000'
A4 '\u0020'
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
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
JavaBeat 2005, India (www.javabeat.net)
Submit a Site - Directory - Submit Articles