Appending text in string

I want to append a string at runtime but t开发者_如何学Pythonhis code again add the previous word not to append new word.

Customer.java:

public String getCustomerQuestion() {
  return CustomerQuestion;
 }
public void setCustomerQuestion(String customerQuestion) {
CustomerQuestion = customerQuestion;
}
public void appendmessage(String msg){
CustomerQuestion = CustomerQuestion +" "+ msg;
}

Main.java:

Customer  _Customer =new Customer();
Request_Message Request= new Request_Message;
_Customer.setCustomerQuestion(Request.getInput());
String _string=Request.getInput();
_Customer.appendmessage(_string);
String str=__Customer.getCustomerQuestion();
System.out.println("now new Question() is"+str);

When I write ram then press enter after again when I write singh it show result: ram ram on console. I want to show display ram singh as a string. `public class Request_Message { { private String _Input;

public void setInput (String line) { _Input = line; } public String getInput() { return _Input; }`

It takes the input from a chat window.

You haven't shown what Request.getInput() does. I suspect that's the problem. What happens if you run:

System.out.println(Request.getInput());
System.out.println(Request.getInput());

and enter the two different strings?

If you could post a short but complete program, we could definitely work out what's going on.

(On a side note, if you follow normal Java naming conventions it's likely to be easier for others to follow your code.)

Don't use string concatenation. Use a proper StringBuffer instead.

private StringBuffer customerQuestion = new StringBuffer();

public void appendmessage(String msg){
    customerQuestion.append(msg);
}

public String getCustomerQuestion() {
    return customerQuestion.toString();
}

Granted, this is probably not the cause of your specific issue (for that matter see Jon Skeet's answer), but this might be a bottleneck in the future. A StringBuffer is the proper way of having a String and concatenating text to it over time.