Umwandlung in Groß- und Kleinschreibung in Java

Question

Ich möchte das erste Zeichen einer Zeichenfolge in Großbuchstaben und den Rest der Zeichen in Kleinbuchstaben umwandeln. Wie kann ich das tun?

Ejemplo:

String inputval="ABCb" OR "a123BC_DET" or "aBcd"
String outputval="Abcb" or "A123bc_det" or "Abcd"

Answer 1

/* This code is just for convert a single uppercase character to lowercase 
character & vice versa.................*/

/* This code is made without java library function, and also uses run time input...*/

import java.util.Scanner;

class CaseConvert {
char c;
void input(){
//@SuppressWarnings("resource")  //only eclipse users..
Scanner in =new Scanner(System.in);  //for Run time input
System.out.print("\n Enter Any Character :");
c=in.next().charAt(0);     // input a single character
}
void convert(){
if(c>=65 && c<=90){
    c=(char) (c+32);
    System.out.print("Converted to Lowercase :"+c);
}
else if(c>=97&&c<=122){
        c=(char) (c-32);
        System.out.print("Converted to Uppercase :"+c);
}
else
    System.out.println("invalid Character Entered  :" +c);

}

  public static void main(String[] args) {
    // TODO Auto-generated method stub
    CaseConvert obj=new CaseConvert();
    obj.input();
    obj.convert();
    }

}

/*OUTPUT..Enter Any Character :A Converted to Lowercase :a 
Enter Any Character :a Converted to Uppercase :A
Enter Any Character :+invalid Character Entered  :+*/