java字符串大小写转换的两种方法

转载自：飞扬青春sina blog
java字符串大小写转换的两种方法
 
import java.io..*
 
public class convertToPrintString
 {   
       public static void main(String[] args) throws IOException
       {
            InputStreamReader reader = new InputStreamReader(System.in); 
            BufferedReader input = new BufferedReader(reader); 
            System.out.print("Please enter your word:"); 
            String text =  input.readLine(); 
            String s = convertString(text); 
            System.out.println(s);
        }
        //第一种方法
       public static String convertString(String src)
       {
            char[] array = src.toCharArray();
             int temp = 0;
             for (int i = 0; i < array.length; i++)
             {
                 temp = (int) array[i];
                 if (temp <= 90 && temp >= 65)
                 { // array[i]为大写字母
                     array[i] = (char) (temp + 32);
                 } else if (temp <= 122 && temp >= 97)
                           { // array[i]为小写字母
                                array[i] = (char) (temp - 32);
                 }
              }
              return String.valueOf(array);
          }
        
          //第二种方法
           public static String convertString(String str)
           {
               String upStr = str.toUpperCase(); 
               String lowStr = str.toLowerCase(); 
               StringBuffer buf = new StringBuffer(str.length()); 
               for(int i=0;i
               { 
                  if(str.charAt(i)==upStr.charAt(i))
                  { 
                      buf.append(lowStr.charAt(i)); 
                  }
                 else
                 {
                     buf.append(upStr.charAt(i)); 
                  } 
                } 
                return   buf.toString(); 
             }
 ｝