Question

Match the following

column A column B

Comment. 1. java.util.Scanner

Wrapper 2. length

char[] myletters 3. final int x=10;

import java.io.* 4. catch

ArrayList 5.alpha

String Class 6.double

Switch 7.inputfile.close();

try 8.remove()

Constant 9.default

Keyboard Input 10.compare

Answer 1

The question data is as below:

Comment. 1. java.util.Scanner

Wrapper 2. length

char[] myletters 3. final int x=10;

import java.io.* 4. catch

ArrayList   5.alpha

String Class 6.double

Switch 7.inputfile.close();

try 8.remove()

Constant 9.default

Keyboard Input 10.compare

After Matching:

Keyboard Input 1. java.util.Scanner

Scanner class is used to read to imput form the keyboard.

Scanner sc = new Scanner(System.in);

String s = new sc.nextLine(); //Reading String

char[] myletters 2. length

length is the attribute used to measure the length of an array.

char[] myletters = new char[10];

int len = myletters.length;

Constant 3. final int x=0

The variable value which cannot be changed in the program once it is assigned. In java, finall variable value cannot be changed in the program.

try 4. catch

In java, the code that might throw exception is place in try blocl and if any exception is thrown then it will handled using catch black.

try{

int i=0;

int a =10/i ;

} catch(Exception e){

e.printStackTrace();

}

Wrapper 6. double

A Wrapper class is used to convert the primitive data types into its corresponding objects.

we can convert double datatype into Double class object.

double d = 250.5;

Double doubleobj = new Double(d);

import java.io.* 7.inputfile.close();

java.io package has methods to read input file and write output to a file. inputfile.close() also belongs to java.io/* package.

ArrayList 8.remove()

ArrayList class has a method remove() which is used to remove the elements in the ArrayList.

If we add pramater of index to remove() then element at index 'i' will get removed.

ArrayList<Integer> a = new ArratList<Integer>();

a.remove(2);

Switch 9. default

switch is used to compare a value against the list of values. If the given value does not match with any case in th swith, then default case will be executed.

Comment 10. compare

compare suit is used to audit and comment the changes in the document.

The only possible combination left is:

String Class 5. alpha

The only common point String class and Alpha class, both are extending Object class. i.e, String and Alpha are subclasses of Object.

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