Replace Character in String
This example replaces a character with a specified character in a given
string.
To replace a character with the given character in sting first
convert the string into char array. Use getChars(int scrStart,
int scrEnd, char[] destChar, int destStart) method for converting a string into an
array of characters. Then use while loop for comparing the "oldChar" (
character name for replace) to be change with the new character of the array. If any match find then
replace the "oldChar" with newChar (character name to replace) and set
flag =1. To convert charArray into string, pass "charArray"
into String class.
getChars(int scrStart, int scrEnd, char[] destChar,
int destStart): This method returns an array of characters from a string. We are passing
four parameter into this method. First parameter scrStart is the starting point while
second parameter scrEnd is the end point of the source string to convert
the string into a char array. The destChar is the destined array which stores all
the characters. The destStart is
starting index to store the characters.
The code of the program is given below:
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");
}
}
}
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The output of the program is given below:
C:\replace>javac Replace.java
C:\replace>java Replace
Your String before repalce
rajesh raju raja rahul ray rani ram
Your String after repalceing 'h' with 'j'
gajesh gaju gaja gahul gay gani gam
Your char has been replaced
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