Basic String Operations in Java

public class StringOperations {

public static void main(String args[]){
String str1="Hello";
String str2="Ja va";
String str3="Hello";

// String Operations

System.out.println("String1 == String3"+ str1.equals(str3));
System.out.println("String2 at Index 2:"+str2.charAt(2));
System.out.println("Compare Str2 and Str3"+str2.compareTo(str3));
System.out.println("Compare str1 and str3"+str1.compareTo(str3));
System.out.println("String2 contains Ja: "+str2.contains("Ja"));
System.out.println("String is empty ?"+str1.isEmpty());
System.out.println("Sting HashCode"+ str1.hashCode());
System.out.println("Substring of String1"+str1.substring(2, 3));
System.out.println("Remove whitespaces in String2"+str2.trim());
System.out.println("Convert to LowerCase"+str2.toLowerCase());
System.out.println("Replace a with A"+str3.replace('a','A'));
}
}

OutPut:

========

String1 == String3true

String2 at Index 2: 

Compare Str2 and Str32

Compare str1 and str30

String2 contains Ja: true

String is empty ?false

Sting HashCode69609650

Substring of String1l

Remove whitespaces in String2Ja va

Convert to LowerCaseja va

Replace a with AHello

Vector Operations Using Java Programming

import java.util.Iterator;
import java.util.Vector;

public class VectorOperations {

public static void main(String args[]){
Vector vt=new Vector();

vt.add(21);
vt.add(12);
vt.add(57);
vt.add(29);
vt.add(43);

System.out.println("Vector"+vt);

//Adding elements in Vector
vt.add(2, 25);
System.out.println("Vector"+vt);
vt.addElement(23);
System.out.println("Vector"+vt);

//Vector Operations.
System.out.println("Capacity"+vt.capacity());
System.out.println("Conatains 43:"+vt.contains(43));
System.out.println("First element"+vt.firstElement());
System.out.println("Value at Index 4: "+vt.get(4));
System.out.println("Remove value at 3"+vt.remove(3));

vt.add(43);
vt.add(45);
vt.add(46);
vt.add(47);
vt.add(48);
vt.add(49);
vt.add(32);
vt.add(33);
vt.add(34);

System.out.println("Vector Elements afte insertion more than 10 elements");
Iterator it=vt.iterator();
while(it.hasNext())
System.out.print(" "+it.next());
}

}

Output:

Vector[21, 12, 25, 57, 29, 43, 23]

Capacity10

Conatains 43:true

First element21

Value at Index 4: 29

Remove value at 357

Vector Elements afte insertion more than 10 elements

 21 12 25 29 43 23 43 45 46 47 48 49 32 33 34