Since there is a "replaceFirst" method in java, is there a "replaceLast" method?

[Lowie Jim]

i'm trying to change the last character per word
in the input sentence by the word java..

this program below works...
but there is some major problems with it


//addjava2.java

import javax.swing.JOptionPane;

public class addjava2
{
public static void main(String args[])
{
String sentence,Nsuf="java",tempword=" ",suf="",newsentence=" ",pass="";
int wordLn=0,index=0,nofchar=0;

sentence=JOptionPane.showInputDialog("Enter a sentence:");
nofchar=sentence.length();


JOptionPane.showMessageDialog(null,"YOU ENTERED:\n"+sentence);

while(index<nofchar)
{ while(index<nofchar && sentence.charAt(index)==' ')
{

tempword=" ";
index++;
}


while(index<nofchar && sentence.charAt(index)!=' ')
{
tempword+=sentence.charAt(index);
index++;
}

{

wordLn=tempword.length();
suf=tempword.substring(wordLn-1,wordLn);
pass=tempword.replace(suf,Nsuf);
newsentence+=pass;
}
}

JOptionPane.showMessageDialog(null,"RESULT:\n"+newsentence);
System.exit(0);
}}

for example i enter a sentence of :"Enter JaVa"
my assume output should be : "Entejava JaVjava"
but the OUPUT is:
"Entejava JjavaVjava"

i want to use a replacelLast method so i can only replace the last occurence of letter but the compiler said it doesn't recognize the method..

please help me please..