DEV Community: Dinesh Nagarajan

Find out the max & min value in given array

Dinesh Nagarajan — Thu, 24 Jul 2025 11:31:04 +0000

public static void main(String[] args) {
// TODO Auto-generated method stub

    //Max Value:

    int []marks= {5,10,20,50,40,60};
    int max=0;

    for(int i=0;i<=marks.length-1;i++) {

        if(marks[i]>max) {

            max=marks[i];
        }
    }
   System.out.println(max);

System.out.println(">>>>>>>>>>>>>>>");

    int min=10;

    for(int i=0;i<=marks.length-1;i++) {

    if(marks[i]<min) {

        min=marks[i];

    }

}

    System.out.println(min);

}

}

String,StringBuffer,StringBuilder using == Operator.

Dinesh Nagarajan — Thu, 24 Jul 2025 11:30:10 +0000

public static void main(String[] args) {
// TODO Auto-generated method stub

    // Primitive Data Types:
        int no1 = 10;
            int no2 = 10;
            System.out.println(no1 == no2);    // == operator comparing the value.
            //Output: "true"

            // Non Primitive Data Types--->    "String"
            // with new keyword using string
            String s1 = new String("hello");
            String s2 = new String("hello");  
            System.out.println(s1 == s2);     // == Operator comparing the object.
            //Output: "False"

            System.out.println(s1.equals(s2)); // equals() method is used to compare the value.
            //Output: "False" 

            // Without new keyword using string
            String a1 = "welcome";
            String a2 = "welcome";
            System.out.println(a1 == a2);      // == operator comparing the value because its having same value for both variables on same location.
            System.out.println(a1.equals(a2)); // equals() method is used to compare the value. 



    //StringBuffer 
            StringBuffer sb1 = new StringBuffer("java");
            StringBuffer sb2 = new StringBuffer("java");
            System.out.println(sb1 == sb2);                   
            // StringBuffer objects are created on the heap, and even if they have the same content,new StringBuffer() creates distinct objects in memory
            //Output: "False"
            System.out.println(sb1.equals(sb2));  
            //The equals() method in StringBuffer (and StringBuilder) is inherited from Object and by default performs a reference comparison
            //Output: "False"

    //StringBuilder
            StringBuilder sg1 = new StringBuilder("sql");
            StringBuilder sg2 = new StringBuilder("sql");
            System.out.println(sg1 == sg2); 
            //StringBuilder objects are created on the heap, and even if they have the same content,new StringBuilder() creates distinct objects in memor
            //Output: "False"
            System.out.println(sg1.equals(sg2));
            //The equals() method in StringBuilder is inherited from Object and by default performs a reference comparison
            //Output: "False"
}

}

Array

Dinesh Nagarajan — Tue, 22 Jul 2025 13:14:59 +0000

//Print all elements in array

     int a[]= {11,23,45,6,8,10,5};

        System.out.println("Array Before Reversed:");

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

            System.out.print(" "+a[i]);
        }

        System.out.println();

    //Reverse the Array:    
        System.out.println("Array After Reversing:");

        for (int i = a.length-1; i>=0; i--) {

            System.out.print(" "+a[i]);

    }

            //Sum the elements in Array:

        int sum = 0;
           for (int i = 0; i < a.length; i++) {
                sum += a[i];

                  }
            System.out.println();

System.out.println("Sum of given array is "+ sum);
}

}

Access Modifier and its types(Public,Private,Protect,default)

Dinesh Nagarajan — Fri, 04 Jul 2025 13:12:09 +0000

Inheritance and its types

Dinesh Nagarajan — Thu, 03 Jul 2025 13:28:59 +0000

Basic Loop codes & overview of OPPs (Inheritance and Types of inheritance).

Dinesh Nagarajan — Wed, 02 Jul 2025 10:51:51 +0000

Git clone Procedures and commands

Dinesh Nagarajan — Tue, 01 Jul 2025 12:01:19 +0000

Basic Looping Statements using while loop,for loop

Dinesh Nagarajan — Sat, 28 Jun 2025 13:11:40 +0000

while loop Example:

class whileLoop {
public static void main(String args[])
{
int i = 1;

    // test expression
    while (i < 6) {
        System.out.println("Hello World");

        // update expression
        i++;
    }
}

}

for loop Example:

package Demo;

public class Practice {

        public static void main(String args[]) {
        int s = 0;

        // for loop begins
        // and runs till x <= 20
        for (int x = 1; x <= 20; x++) {
            s = s + x;
        }
        System.out.println("Sum: " + s);
    }
}

Java program using if, else if, else and switch case

Dinesh Nagarajan — Fri, 27 Jun 2025 13:21:30 +0000