문자열 대소 문자 변환 을 비교 하지 않 아 도 됩 니 다.

/**
 *               
 * @author   
 *
 */
public class TranslateString {
	
	
	//           
	private static boolean isUpper(char c){
		int acsii=(int)c;
		return (acsii&32)==0?true:false;
	}
	
	//           
	private static char toUpper(char c){
		return (char)((int)c-32);
	}
	
	//     
	public static String toUpper(String toTranslate){
		char[] arrC=toTranslate.toCharArray();
		//StringBuilder sb=new StringBuilder();
		for(int i=0;i<arrC.length;++i){
			if(!isUpper(arrC[i])){
				arrC[i]=toUpper(arrC[i]);
			}
		}
		return new String(arrC);
		
	}
	
	
	public static void main(String[] args) {
		System.out.println("    ASCII ");
		System.out.println("a="+(int)'a');
		System.out.println(Integer.toBinaryString((int)'a'));
		System.out.println("z="+(int)'z');
		System.out.println(Integer.toBinaryString((int)'z'));
		System.out.println("A="+(int)'A');
		System.out.println(Integer.toBinaryString((int)'A'));
		System.out.println("Z="+(int)'Z');
		System.out.println(Integer.toBinaryString((int)'Z'));
		
		
		String toTranslate="fsdfSDdSDdSdfdFejnvBdl";
		System.out.println(TranslateString.toUpper(toTranslate));
	}

}

<img src="http://img.blog.csdn.net/20150228224827054?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvZGN0ODg4OA==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast" alt="" />