public class Replace{
	public static void main(String s[]){
		String string="rajesh raju raja rahul ray rani ram";
		char  oldChar='r';
		char newChar='g';
		int numChar=string.length();
		char[] charArray=new char[numChar];
		string.getChars(0, numChar, charArray,0);
		int i=0,flag=0;	
		System.out.println("Your String before repalce\n"+string);
		while(i<charArray.length)
		{
		if(charArray[i]==oldChar)
			{
			charArray[i]=newChar;
			flag=1;
			}
		i++;
		}
		if(flag==1)
			{
			System.out.println("\nYour String after repalceing 'h' with 'j'");
			String newString=new String(charArray);
			System.out.println(newString+"\n\nYour char has been replaced");
			}
		if(flag==0)
			{
			System.out.println("\nThe char not found");
			}			
	}
}