String Handling

 String - It is a collection of characters. 

Program- 

public class str

{

public static void main(String args[]) 

{

String data;

data = "Mynameiskhan";

System.out.println(data); 

}

} 

 

Functions used in String handling-

-> used for output

1. charAt(index) - it is used to display a character in the string, by giving the appropriate index.  

ex- String data1 = "Chitransh"; 

data1.charAt(2);

-> i

2. codePointAt(index) - it is used to display the ascii value of given character.

ex- String data1 = "Chitransh"; 

data1.codePointAt(3); 

-> 116(ascii code of t)

3. codePointBefore(index) - giving the ascii code of the character before the given index of the character.

ex- String data1= "Chitransh"; 

data1.codePointBefore(3);

-> 105(ascii code of i) // index is given 3 but displays the output for index position 2. 

4. compareTo() - it returns the values in the form of 0(if true) or non zero(if false).

ex-String data1 = "Chitransh";

String data2 = "chitransh";

data1.compareTo(data2); 

-> -3

here, the function will return the value other than zero(Case is different).

5. compareToIgnoreCase() - It will compare two string values ignoring the case of their strings. 

ex-String data1 = "Chitransh"; 

String data2 = "chitransh"; 

data1.compareToIgnoreCase(data2); 

-> 0

here, the function will return 0 instead of different case in two strings

6. equals() - it compares two strings and returns the value true or false. 

ex- String data1 = "Chitransh";

String data2 = "Chitransh"; 

data1.equals(data2);

-> true

7. concat() - it is used to concatinate two strings. 

ex- String data1 = "Chitransh";

String data2 = "Thakur"; 

data1.concat(data2);

-> Chitransh Thakur

8. toUpperCase() - it converts the string value into upper case.  

ex- String data1 = "chitransh";

data1.toUpperCase();

-> CHITRANSH

9. toLowerCase() - it converts the string value into lower case. 

ex- String data1 = "ChiTransh"; 

data1.toLowerCase();

-> chitransh

10. isEmpty() - checks whether the string is empty or not. 

ex- String data1 = ""; 

if(data1.isEmpty())

{  

System.out.println("String is empty"); 

}

 -> String is empty



Comments

Post a Comment

Popular posts from this blog

Creating button control

Frame Creation-  Frame can be created using two methods-  1. Inherites Frame class.  2. Create the object of Frame class.  Here we will create button using Frame(through second method)-  import java.awt.*;  class first  {  first()  {  //Create an object of Frame  Frame F1= new Frame();  //Create an object of button Button b1= new Button ("click me");   // Set the attribute of button //setBounds (left,top,width,height); b1.setBounds(50,80,80,80);   //add() is used to add the button control to Frame F1.add(b1);  //Call the functions using Frame's object F1.setSize(400,400);  F1.setLayout(null);  F1.setVisible(true);   }  public static void main(String args[])  {  first Fst1= new first();  }  }
Read more

Creating Control Programs

  1. TextField- TextField is used for singleLine input. PROGRAM- import java.awt.*; class text1  {  text1() {    Frame f1 = new Frame("e.g TextBox");     TextField t1 = new TextField("Enter your name");   t1.setBounds(50,100,200,30);   f1.add(t1);  f1.setSize(400,400);  f1.setLayout(null);  f1.setVisible(true); }  public static void main(String args[]) {    text1 te1 = new text1(); } } 2. TextArea- TextArea is used for MultiLine input. PROGRAM- import java.awt.*; class text2  {  text2() {     Frame f1 = new Frame("Text area example");     TextArea ta1 = new TextArea("WELCOME TO JAVA");         ta1.setBounds(10,30,300,300);     f1.add(ta1);    f1.setSize(400,400);   f1.setLayout(null);   f1.setVisible(true); } public static void main(String args[]) {    text2 ta2 = new text2(); } } 3. Checkbox-  Checkbox is used for...
Read more