Module# 15: String Class Lecture#56: String Class

// Example 56.1: Demonstration of String objects

import java.lang; // It is not necessary as it is by default imported in all programs.

class BasicStringDemo {

public static void main(String args[]) {

String strOb1 = "First String";

String strOb2 = "Second String";

String strOb3 = strOb1 + " and " + strOb2;

System.out.println(strOb1);

System.out.println(strOb2);

System.out.println(strOb3);

String myString = “Joy with Java”;

System.out.println(myString);

System.out.println(“Welcome”);

System.out.println(“Welcome” + “ “ + myString);

String aString = “An example of string is ” + myString;

}

}

// Example 56.2: String as command line arguments

class CommandLineDemo {

public static void main(String args[]) {

System.out.println(“Number of arguments” “ + args.length);

if(args.length == 0)

return;

for(int i=0; i<args.length; i++)

System.out.println("args[" + i + "]: " + args[i]);

}

}

// Example 56.3: Creating string objects

class StringDemo {

public static void main(String args[]) {

String s1 = “N P T E L”;

System.out.println(“length" + s1.length]);

System.out.println(s1;

String s2 = new String (“NPTEL”);

System.out.println(s2 + “is of” + s2.length]);

String s2 = new String (“NPTEL”);

String s3 = new String (s1 + s2);

}

}

// Example 56.4 : Create a String using literal and print

public class createStringDemo{

public static void main(String args[]){

String text = "DATA STRUCTURE WITH JAVA";

System.out.print(text);

}

}

// Example 56.5 : length() of String

public class StringLengthDemo{

public static void main(String args[]){

String text = "DATA STRUCTURE WITH JAVA";

int stringLength = text.length();

System.out.print(stringLength);

}

}

// Example 56.6 : charAt()

public class CharAccessDemo{

public static void main(String args[]){

String text = "DATA STRUCTURE WITH JAVA";

char data = text.charAt(4);

System.out.print(data);

}

}

// Example 56.7 : concat()

public class StringMergingDemo{

public static void main(String args[]){

String text1 = "DATA STRUCTURE WITH";

String text2 = " JAVA";

String text3 = text1.concat(text2);

System.out.print(text3);

}

}

// Example 56.8 : toLowerCase()

public class StringToLowerCaseDemo{

public static void main(String args[]){

String text = "Data Structure with Java";

String output = text.toLowerCase();

System.out.println(output);

}

}

// Example 56.9: toUpperCase()

public class StringToUpperCaseDemo{

public static void main(String args[]){

String text = "Data Structure with Java";

String output = text.toUpperCase();

System.out.println(output);

}

}

// Example 56.10 : trim()

public class TrimStringDemo{

public static void main(String args[]){

String text = " Data Structure with Java ";

String output = text.trim();

System.out.println(output);

}

}

// Example 56.11 : replace()

public class StringReplaceDemo{

public static void main(String args[]){

String text = "Data Structure with C++";

String output = text.replace("C++" ,"Java");

System.out.println(output);

}

}