Quiz on Java Array

Which of the following is not a syntax of a Single dimensional Array?

 class ArraySample {

Public static void main ( String args [ ] )

{

int rollno[ ] = { 1 , 2 , 3 , 4, 5 };

for( i = 0; i < a.length; i++ )

{

system.out.println(rollno[i]);

}

}

}

class ArrayInitialization {

public static void main ( String args [ ] )

{

int marks[ ] = new int [4];

marks[0] = 65;

marks[1] = 70;

marks[2] = 74;

marks[3] = 90;

marks[4] = 87;

for(i=0; i<marks.length ; i++)

{

system.out.println(marks[i]);

}

}

}

 class JaggedArray {

public static void main ( String args [ ] )

{

 int arr[][] = new int[3][];  

     arr[0] = new int[1];  

arr[1] = new int[2];  

            arr[2] = new int[3];  

int number = 0;

for (int x=0; x<arr.length; i++)  

            for(int y=0; y<arr[x].length; j++)  

            arr[x][y] = number++;

     for (int x=0; x<arr.length; x++)

{  

            for (int j=0; y<arr[x].length; y++)

{  

            System.out.print(arr[x][y]+” “);  

            }

}

}

}

class Exception {   

public static void main ( String args [ ] )

{

int arr[ ] = new int[-2];

arr[0] = 1;

arr[1] = 2;

arr[2] = 3;

for( i = 0; i < arr.length; i++ )

{

system.out.println(arr[i]);

}

}

}

Which loop / statement in Java is used to display elements in an array ?

class ArrayMethod {

    void get() {

int disp=arr[0];  

for(int i=2;i<arr.length;i++)  

 if(disp>arr[i])  

 disp=arr[i];   

System.out.println(disp);  

}

public static void main ( String args [ ] )

{

int a[]={ ‘a’ , ‘b’ , ‘c’ , ‘d’ };

disp(a);

}

Which of the following is the syntax to get the length of an array for a single dimensional array?

class  ArrayElements {

public static void main ( String args [ ] )

{

String coding[ ] = { “C” , “C++” , “Java”};

coding[0] = “Python”;

for( i = 0 ; i <coding.length; i++)

{

system.out.println(coding[i]);

}

}

}

 class Traversal {

public static void main ( String args [ ] )

{

String names [ ] = { “DataFlair” , “Godaddy” , “Grandma’s Kitchen” , “Infogates” };

system.out.println(names[0]);

}

}

 class Multidimensional {

public static void main ( String args [ ] )

{

int array[] [] = { {100,200} , {300,400} };

for(int i = 0; i<arr.length ; i ++)

{

for( int j = 0 ; j < arr.length ; j++ )

{

system.out.println( arr [i] [j] );

}

}

}

}

int size[] = {  };

class Exception {

public static void main ( String args [ ] )

{

char arr[5] = { ‘a’ , ‘b’ , ‘c’ , ‘d’ , ‘e’ }

system.out.println(arr[3]);

}

}

What is the name of the method where an array is declared without mentioning size of the array ?

class ArraySize {

public static void main ( String args [ ] )

{

int marks[ ] , a ;

a = 5;

marks = new marks[a];

}

}