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public String replace(char searchChar, char newChar)

public class Main {
    public static void main(String args[]) {
        String Str = new String("tutorialpro");

        System.out.print("Return Value :" );
        System.out.println(Str.replace('o', 'T'));

        System.out.print("Return Value :" );
        System.out.println(Str.replace('u', 'D'));
    }
}

Return Value :RunTTb
Return Value :RDnoob