不用比较实现字符串大小写转换

/**
* 不用比较实现字符串大小写转换
* @author 承天
*
*/
public class TranslateString {

//判断单个字母是不是大写
private static boolean isUpper(char c){
int acsii=(int)c;
return (acsii&32)==0?true:false;
}

//单个小写字母转换成大写
private static char toUpper(char c){
return (char)((int)c-3
4000
2);
}

//转换成大写
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("小写字母ASCII码");
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));
}

}

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