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JAVA notes PDF Download - Handwritten Notes

Core Java

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3- Core Java Notes Ratan Sir-        Download

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3- JavaEE / J2EE Santosh Sir Notes- Download

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Deadlock in Java and Solution

Deadlock in Java and Solution

Please find below the program for Deadlock in Java.

class A { } class B { } public class HelloWorld { final static A a = new A(); final static B b = new B(); public static void main(String[] args) { // Thread 1 Runnable thrd1 = () -> { // Resource a synchronized (a) { try { Thread.sleep(100); } catch (InterruptedException ex) { } // Resource b synchronized (b) { System.out.println("Thread 1"); } } }; // Thread 2 Runnable thrd2 = () -> { // hold Resorce b by thread1 synchronized (b) { synchronized (a) { System.out.println("Thread 2"); } } }; // threads start new Thread(thrd1).start(); new Thread(thrd2).start(); // Solution : To Avoid Deadlock, replace sequence of resources } }

Solution: To Avoid Deadlock, replace the sequence of resources

Program Link

Java 8 - Interface and Class

Please check one of the features of Java 8 related to the Interface and Class 

Program : 

public class HelloWorld{ public static void main(String []args){ Child c = new Child(); c.show();// this will print "Class" } } interface I { default void show(){ System.out.println("Interface"); } default void showAgaing(){ // we define multimple default method under Interface System.out.println("Interface again"); } } class C { public void show(){ System.out.println("Class"); } } class Child extends C implements I{ // public void show(){ // System.out.println("Child"); // } }

Code Link

Array Program 1 : Find Evenly Repeated number from an Array

Array Program 1: Find the Evenly Repeated number from an Array


Input: int[] a = {1,1,5,4,8,1,5,8,3,9,15,15,16,2,8,7,9,1};

Output : [1, 5, 9, 15]

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

package JavaPractice; import java.util.ArrayList; import java.util.Arrays; import java.util.List; public class ArraysEvenOccurance { public static void main(String arg[]){ int[] input = {1, 1, 5, 4, 8, 1, 5, 8, 3, 9, 15, 15, 16, 2, 8, 7, 9, 1}; int[] output = new int[input.length]; // sort input array Arrays.sort(input); int counter = 1, k = 0, j=0; for (int i = 1; i < input.length; i++) { if (input[k] == input[i]) { // check for same number counter++; } else { // check even number of counter if (counter % 2 == 0) { output[j] = (input[k]); j++; } counter = 1; k = i; } } // Removing Extra appended element (sub array) output = Arrays.copyOfRange(output, 0, j); // Print Result array System.out.println(Arrays.toString(output)); } }