PROGRAM TO DEMONSTRATE THE USE OF STRING CLASS AND EMPLOYING AT LEAST 10 STRING HANDLING METHODS

class StringMethods

{    public static void main(String args[ ])

{    String string1 = new String ("WELCOME TO");

String string2 = new String (" JAVA PROGRAMMING");

String s3,s4,s5,s6,s7,s8;

boolean b;

char ch;

int a,c;

System.out.println("\n\nSTRING1 is  : "+string1);

s3 = string1.toLowerCase();

System.out.println("\n\nSTRING1 is Converted into Lower Case       : "+s3);

s4 = string1.toUpperCase();

System.out.println("\n\nSTRING1 is Converted into Upper Case       : "+s4);

s5 = string1.replace ('O','A');

System.out.println("\n\nSTRING1's character 'O' is Replaced by 'A'  : "+s5);

a = string1.length();

System.out.println("\n\nLength of The STRING1  is                  : "+a);

ch = string1.charAt(5);

System.out.println("\n\nThe Character Present at Index value = 5 in the STRING1 is : "+ch);

s7 = string1.substring(5);

System.out.println("\n\nThe Substring  Starting from index value = 5 of STRING1 is :"+s7);

s6 = string1.trim();

System.out.println("\n\nAfter Remove White Spaces at the Beg. and End of the STRING1 is : "+s6);

System.out.println("\n\nSTRING2 is  : "+string2);

b  = string1.equals(string2);

System.out.println("\n\nAre Both Strings Equal? True  or  False    : "+b);

s6 = string1.concat (string2);

System.out.println("\n\nThe Concatenates of  STRING1 &  STRING2 is : "+s6);

s8 = string2.substring(5,11);

System.out.println("\n\nThe Substring Start from index value = 5 to 11 of STRING2 : "+s8); //Not including 11th index value

}

}

Program to Find the Sum of the Digits of a Number

import java.io.*;
class Add
{
void number()
{
try
{
int num,sum=0;
System.out.println("Enter any number:");
DataInputStream dts=new DataInputStream(System.in);
int n=Integer.parseInt(dts.readLine());
while ( n > 0 )
{
num = n % 10;
n = n / 10;
sum = sum + num;
}
System.out.println("The sum of the digits is:"
+sum);
}
catch(Exception s)
{
System.out.println(s.getMessage());
}
}
}
class Digit_add
{
public static void main(String args[])
{
Add a = new Add();
a.number();
}
}

Whether a Number is Palindrome or Not?

import java.io.*;
class rev
{
public static void main(String a[ ])
{
int n, m, rev = 0;
int k = Integer.parseInt(a[0]);
n = k;
while( n > 0 )
{
m = n % 10;
rev = ( rev * 10 ) + m;
n = n / 10;
}
if( rev == k )
System.out.println("palindrome" );
else
System.out.println(" not palindrome" );
}
}

Add two matrices

import java.lang.*;
import java.io.*;
class addmatrix
{
static void add()
{
int a[][], b[][], c[][];
a = new int[2][2];
b = new int[2][2];
c = new int[2][2];
DataInputStream dts=new DataInputStream(System.in);
try
{
System.out.println("enter first matrix
2*2 order :");
for(int i=0;i<2;i++)
{
for(int j=0;j<2;j++)
{
a[i][j]=Integer.parseInt(dts.readLine());
}
}
System.out.println("enter second matrix
2*2 order :");
for(int i=0;i<2;i++)
{
for(int j=0;j<2;j++)
{
b[i][j]=Integer.parseInt(dts.readLine());
}
}
for(int i=0;i<2;i++)
{
for(int j=0;j<2;j++)
{
c[i][j]=a[i][j]+b[i][j];
}
}
for(int i=0;i<2;i++)
{
for(int j=0;j<2;j++)
{
System.out.print(c[i][j]+" ");
}
System.out.println("\t");
}
}
catch(Exception x)
{
System.out.println("error");
}
}
public static void main(String arg[])
{
add();
}
}