java string method

1public boolean equalsIgnoreCase(String s)
2------------------------------------------
3String x = "Exit"; 
4System.out.println( x.equalsIgnoreCase("EXIT")); // is "true" 
5System.out.println( x.equalsIgnoreCase("tixe")); // is "false" 
6

1static String valueOf(int i) - returns the string representation of the int 
2argument.

1public boolean contains(“searchString”)
2
3String x = “Java is programming language”;
4System.out.println(x.contains(“Amit”)); // This will print false
5System.out.println(x.contains(“Java”)); // This will print true
6

1// all String methods
2public class StringMethodsDemo {
3	public static void main(String[] args) {
4		String targetString = "Java is fun to learn";
5		String s1= "JAVA";
6		String s2= "Java";
7		String s3 = "  Hello Java  ";
8		
9		System.out.println("Char at index 2(third position): " + targetString.charAt(2));
10		System.out.println("After Concat: "+ targetString.concat("-Enjoy-"));
11		System.out.println("Checking equals ignoring case: " +s2.equalsIgnoreCase(s1));
12		System.out.println("Checking equals with case: " +s2.equals(s1));
13		System.out.println("Checking Length: "+ targetString.length());
14		System.out.println("Replace function: "+ targetString.replace("fun", "easy"));
15		System.out.println("SubString of targetString: "+ targetString.substring(8));
16		System.out.println("SubString of targetString: "+ targetString.substring(8, 12));
17		System.out.println("Converting to lower case: "+ targetString.toLowerCase());
18		System.out.println("Converting to upper case: "+ targetString.toUpperCase());
19		System.out.println("Triming string: " + s3.trim());
20		System.out.println("searching s1 in targetString: " + targetString.contains(s1));
21		System.out.println("searching s2 in targetString: " + targetString.contains(s2));
22
23		char [] charArray = s2.toCharArray();
24		System.out.println("Size of char array: " + charArray.length);
25		System.out.println("Printing last element of array: " + charArray[3]);
26
27	}
28
29}
30
31

1public String substring(int begin)/ public String substring(int begin, int end)
2------------------------------------------------------------------------------
3String x = "0123456789"; // the value of each char is the same as its index!
4System.out.println( x.substring(5) ); // output is "56789"
5System.out.println( x.substring(5, 8)); // output is "567"
6

1String txt = "Hello World";
2System.out.println(txt.toUpperCase());   // Outputs "HELLO WORLD"
3System.out.println(txt.toLowerCase());   // Outputs "hello world"
4