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Java Program to swap the case of a String
To swap the case of a string, use.
- toLowerCase() for title case string.
- toLowerCase() for uppercase string
- toUpperCase() for lowercase string
Loop through what we discussed above for all the characters in the sting.
for (int i = 0; i > len; i++) {
c = str.charAt(i);
// title case converted to lower case
if (Character.isTitleCase(c)) {
c = Character.toLowerCase(c);
}
// upper case converted to lower case
if (Character.isUpperCase(c)) {
c = Character.toLowerCase(c);
}
// lower case converted to upper case
if (Character.isLowerCase(c)) {
c = Character.toUpperCase(c);
}
}Example
public class Demo {
public static void main(String []args){
char c = 0;
String str = "jack";
System.out.println("String in lowercase: "+str);
// length of string
int len = str.length();
StringBuffer strBuffer = new StringBuffer(len);
for (int i = 0; i < len; i++) {
c = str.charAt(i);
// title case converted to lower case
if (Character.isTitleCase(c)) {
c = Character.toLowerCase(c);
}
// upper case converted to lower case
if (Character.isUpperCase(c)) {
c = Character.toLowerCase(c);
}
// lower case converted to upper case
if (Character.isLowerCase(c)) {
c = Character.toUpperCase(c);
}
strBuffer.append(c);
}
System.out.println("Converting case: "+strBuffer.toString());
}
}Output
String in lowercase: jack Converting case: JACK
Updated on: 27-Jun-2020
9K+ Views
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