Oop’s Using java

String Comparison

• We can compare String in Java on the basis of content a
• It is used in 
• authentication (by equals() method), 
• sorting (by compareTo() method), 
• reference matching (by == operator).
• There are three ways to compare String in Java:
• == :operator always ment for reference comparision
• String : CompareTo() vs .equals()

equals () ------ Boolean

Ratan Ratan=True

Rattan Anu=false

CompareTo() ------ int R=82 A=65

Ratan Ratan=0

Ratan Anu=17

Anu Ratan=-17

Example of “String Comparision” Program 12

class compare{

 public static void main(String args[]){

String s1=“anu";

String s2=“anu";

System.out.println(s1.equals(s2)); System.out.println(s1==s2);

String s3=new String(“bharath");

String s4=new String(“bharath");

System.out.println(s3.equals(s4)); 

System.out.println(s3==s4);

}

}

• class compare{
•  public static void main(String args[]){
• String s1=“Anu";
• String s2=“Ratan";
• System.out.println(s1.compareTo(s2));//17
• System.out.println(s2.compareTo(s1));///-17

Modifying a String

•  Methods for modifying a String objects.
• substring()
• susubstring(int beginIndex)
• bstring(int beginIndex, int endIndex) 
• concat() -- We can concatenate two strings using concat( )
• replace()
• String replace(char original, char replacement)
• trim()
• IndexOf()
• lastIndexOf()
• toUpperCase()
• toLowerCase()

class Methods{

class Methods{