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import java.io..*
public class convertToPrintString
{
public static void main(String[] args) throws IOException
{
String text = “I am a student”;
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();
}
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