import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class convert { /**
* @param args
*/
public static String conn(String sr)
{
char[] c=sr.toCharArray();
int in =0;
for(int i=0;i<c.length;i++)
{
in=(int)c[in];
if(in<=90&&in>=65)
{
//c[in]
c[in]=(char)(in+32);
} else if(in<=122&&in>=97)
{
c[in]=(char)(in-32);
}
}return String.valueOf(c);
}
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
InputStreamReader is=new InputStreamReader(System.in);
BufferedReader input=new BufferedReader(is);
System.out.println("Welcome To Beijing");
String str = input.readLine();
String s = conn(str);
System.out.println(s);
}
}
import java.io.IOException;
import java.io.InputStreamReader;public class Convert
{ /**
* @param args
*/ public static String conn(String sr)
{
char[] c = sr.toCharArray();
for (int i = 0; i < c.length; i++)
{
if (c[i] <= 90 && c[i]>= 65)
{
c[i] = (char) (c[i] + 32);
} else if (c[i] <= 122 && c[i]>= 97)
{
c[i] = (char) (c[i] - 32);
} }
return String.valueOf(c);
} public static void main(String[] args) throws IOException
{
// TODO Auto-generated method stub
InputStreamReader is = new InputStreamReader(System.in);
BufferedReader input = new BufferedReader(is);
String str = input.readLine();
String s = conn(str);
System.out.println(s);
}
}
这样就可以了
import java.io.IOException;
import java.io.InputStreamReader;
public class convert { /**
* @param args
*/ public static String conn(String sr)
{
char[] c=sr.toCharArray();
int in =0;
for(int i=0;i <c.length;i++)
{
in=(int)c[in]; //改为:in=(int)c[i];
if(in <=90&&in>=65)
{
//c[in]
c[in]=(char)(in+32); //改为:c[i]=(char)(in+32);
} else if(in <=122&&in>=97)
{
c[in]=(char)(in-32); //改为:c[i]=(char)(in-32);
} }return String.valueOf(c);
}
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
InputStreamReader is=new InputStreamReader(System.in);
BufferedReader input=new BufferedReader(is);
System.out.println("Welcome To Beijing"); String str = input.readLine();
String s = conn(str);
System.out.println(s); }
}
public static String StringChange(String s)
{
StringBuilder sb=new StringBuilder(s);
String temp = null;
for (int i = 0; i < s.length(); i++)
{
if(Character.isLowerCase(s.charAt(i)))
{
temp=s.substring(i, i+1).toUpperCase();//把i这个位置小写的字母变成大写并放进temp
sb.replace(i, i+1, temp); //在字符串i这个位置替换temp
}else if(Character.isUpperCase(s.charAt(i)))
{
temp=s.substring(i, i+1).toLowerCase();
sb.replace(i, i+1, temp);
}
}
return sb.toString();
}