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java insert char in string at index

public String addChar(String str, char ch, int position) {
    return str.substring(0, position) + ch + str.substring(position);
}
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add one character to string java

char ch='A';
String str="pple";
str= ch+str;   // str will change to "Apple"
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add character to a string java

public class JavaHungry {
    public static void main(String args[]) {
      char ch = 'J';
      String str = "avaHungry";
      //Adding character at the beginning
      str = ch + str; 
      System.out.println(str); 
    }
}
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append a character to string java

1. String otherString = "helen" + character;

2. otherString +=  character;
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