String in Java (Methods with examples) | String Buffer and String Builder

String in Java (Methods with examples)

public class StringMethods {
    public static void main(String[] args)
    {
        //string compare
        String s="ravi";  // equal method return true or false
        String s1="ravi";
        String s2="kumar";
        String s3="Ravi";
        System.out.println(s.equals(s3));
        System.out.println(s.equalsIgnoreCase(s3));
        System.out.println(s.equals(s2));

        System.out.println("== operator compares references not values");

        String s4="ravi";  //return true false
        String s5="ravi";
        String s6="kumar";
        String s7="Ravi";
        System.out.println(s4==s5);
        System.out.println(s4==s7);
        System.out.println(s4==s6);

        System.out.println("compareTo method return integer value");

        String s8="ravi";
        String s9="ravi";
        String s10="sagar";
        String s11="om";

        System.out.println(s8.compareTo(s9)); //0 because s8==s9
        System.out.println(s8.compareTo(s10)); //-1 because s8(4)<s10(5)
        System.out.println(s9.compareTo(s10));

    }
}

class StringMethod{
    public static void main(String[] args) {
        String s="ravi.com";
        //System.out.println(s.substring(0,8));
        //System.out.println(s.substring(3));
        System.out.println(s.trim());
        System.out.println(s.charAt(6));

        int a=10;
        String s1=String.valueOf(a); // convert String like int char float double etc
        System.out.println(s1+10);

        System.out.println(s.replace("r","p"));
    }
}
_
__________________________________________________

class StringBufferExample{
    public static void main(String[] args) {

        StringBuffer s=new StringBuffer("ravi");
        //String s1="ravi";
       // s.append("kumar");
        //System.out.println(s);
        //s.insert(2,"kumar");
        //System.out.println(s);
        //s.replace(1,2,"f");
        //System.out.println(s);
        System.out.println(s.reverse());

    }

}

String Buffer Example with constructor

class StringPractices {
    int roll_no;
    String name;
    String address;

    StringPractices(int roll_no,String name,String address){
        this.roll_no=roll_no;
        this.name=name;
        this.address=address;
    }
    @Override
    public String toString() {
        return roll_no+" "+name+" "+address;
    }
    public static void main(String[] args) {
        StringPractices str=new StringPractices(100,"ravi","Delhi");
        System.out.println(str);

    }
}
___________________________________________________

Methods in Strings.
public class StringPractice {
    public static void main(String[] args)

    {
String s="Ravi";
     s=s.concat("kumar");
     System.out.println(s);
     String string="ravi kumar sagar";//string literal
        System.out.println(string.substring(8));
        System.out.println(string.toLowerCase());
        System.out.println(string.toUpperCase());
        System.out.println(string.trim()); //
        System.out.println(string.valueOf(string+10));
        System.out.println(string.indexOf("k"));
        System.out.println(string.startsWith("PORT",9));
        System.out.println(string.startsWith("r"));
        String str=new String("PORT : 8080");
        System.out.println(str);
        char ch[] ={'T','R','U','E'};
        String str1=new String(ch);
        System.out.println(str1);
        String ss=new String("Ravi");
        s=ss.concat("kumar");
        System.out.println(ss);
        String s1=40+10+50+"ravi"+10+20;
        System.out.println(s1);
        String s2=" ravi kumar sagar";
        int s4=s2.lastIndexOf("m",5);
        int s5=s2.indexOf(" ");
        System.out.println(s4);
        //String s4=s2.concat(s3);
        System.out.println(s4);
        System.out.println(s2.substring(0,5));
        System.out.println(s2.toUpperCase());
        System.out.println(s2.toLowerCase());
        System.out.println(s2.trim());
        System.out.println(s2.charAt(5));
        System.out.println(s2.length());

       System.out.println(s2.replace("ravi","sonu"));
}
}

Sorting and Searching Programs

• Bubble Sort
• Quick Sort
• Insertion Sort
• Merge Sort
• Selection Sort
• Linear Search and 
• Binary Search

Start with your Choice

-Important Programs for Freshers

• Palindrome Number
• Prime Number
• Swapping Number
• Leap Year
• Odd and Even Number
• Fibonacci Series
• Armstrong Number
• Factorial Number
• Print Table

Learn Pattern Programs 

• Alphabet pattern program in java
• Star Pattern Programs in Java
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Click to learn Array Programs

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• Anonymous Array in Java
• Single Dimensional  Array in Java
• Find Second Largest Number in Array
• Delete an Element in Array in Java 
• Common Element in Array in Java
• Missing Element in Array
• Insert Element in Array
• Reverse Array in Java
• Merge Two Array in Java
• Smallest and Largest Elements in Array
• Find Odd and Even Number in Array

Click to Learn MySQL 

• MySQL Database
• Table & View
• MySQL Query
• Clauses
• Conditions
• MySQL Function
• Join
•  Indexes
• Triggered

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