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# Java Tutorial: Practice Questions on Arrays in Java

Java Arrays Practice Set: In this video, we will see few questions on Java Arrays. We will see some good concepts like how to reverse an array, how to find maximum element in an array etc.

``````package com.company;

public class cwh_29_Practice_Set_6 {
public static void main(String[] args) {
// Practice Problem 1
/* float [] marks = {45.7f, 67.8f, 63.4f, 99.2f, 100.0f};
float sum = 0;
for(float element:marks){
sum = sum + element;
}
System.out.println("The value of sum is " + sum);

// Practice Problem 2
float [] marks = {45.7f, 67.8f, 63.4f, 99.2f, 100.0f};
float num = 45.57f;
boolean isInArray = false;
for(float element:marks){
if(num==element){
isInArray = true;
break;
}
}
if(isInArray){
System.out.println("The value is present in the array");
}
else{
System.out.println("The value is not present in the array");
}

// Practice Problem 3

float [] marks = {45.7f, 67.8f, 63.4f, 99.2f, 100.0f};
float sum = 0;
for(float element:marks){
sum = sum + element;
}
System.out.println("The value of average marks is " + sum/marks.length);

// Practice Problem 4
int [][] mat1 = {{1, 2, 3},
{4, 5, 6}};
int [][] mat2 = {{2, 6, 13},
{3, 7, 1}};
int [][] result = {{0, 0, 0},
{0, 0, 0}};

for (int i=0;i<mat1.length;i++){ // row number of times
for (int j=0;j<mat1[i].length;j++) { // column number of time
System.out.format(" Setting value for i=%d and j=%d\n", i, j);
result[i][j] = mat1[i][j] + mat2[i][j];
}
}

// Printing the elements of a 2-D Array
for (int i=0;i<mat1.length;i++){ // row number of times
for (int j=0;j<mat1[i].length;j++) { // column number of time
System.out.print(result[i][j] + " ");
result[i][j] = mat1[i][j] + mat2[i][j];
}
System.out.println(""); // Prints a new line
}

// Practice Problem 5
int [] arr = {1, 21, 3, 4, 5, 34, 67};
int l = arr.length;
int n = Math.floorDiv(l, 2);
int temp;

for(int i=0; i<n; i++){
// Swap a[i] and a[l-1-i]
// a   b   temp
// |4| |3| ||
temp = arr[i];
arr[i] = arr[l-i-1];
arr[l-i-1] = temp;
}

for(int element: arr){
System.out.print(element + " ");
}

// Practice Problem 6
int [] arr = {1, 2100, 3, 455, 5, 34, 67};
int max = Integer.MIN_VALUE;
for(int e: arr){
if(e>max){
max = e;
}
}
System.out.println("the value of the maximum element in this array is: "+ max);

// Practice Problem 6
System.out.println(Integer.MIN_VALUE);
System.out.println(Integer.MAX_VALUE);
*/
// Practice Problem 7
boolean isSorted = true;
int [] arr = {1, 12, 3, 4, 5, 34, 67};
for(int i=0;i<arr.length-1;i++){
if(arr[i] > arr[i+1]){
isSorted = false;
break;
}
}
if(isSorted){
System.out.println("The Array is sorted");
}
else{
System.out.println("The Array is not sorted");
}

}
}

``````

#java #programming #developer

## Buddha Community  1600135200

## How to Install OpenJDK 11 on CentOS 8

### What is OpenJDK?

OpenJDk or Open Java Development Kit is a free, open-source framework of the Java Platform, Standard Edition (or Java SE). It contains the virtual machine, the Java Class Library, and the Java compiler. The difference between the Oracle OpenJDK and Oracle JDK is that OpenJDK is a source code reference point for the open-source model. Simultaneously, the Oracle JDK is a continuation or advanced model of the OpenJDK, which is not open source and requires a license to use.

#tutorials #alternatives #centos #centos 8 #configuration #dnf #frameworks #java #java development kit #java ee #java environment variables #java framework #java jdk #java jre #java platform #java sdk #java se #jdk #jre #open java development kit #open source #openjdk #openjdk 11 #openjdk 8 #openjdk runtime environment 1623911281

## How to Print an Array in Java

#### Introduction

Printing an array is a quick way to give us visibility on the values of the contents inside. Sometimes the array values are the desired output of the program.

In this article, we’ll take a look at how to print an array in Java using four different ways.

While the “best way” depends on what your program needs to do, we begin with the simplest method for printing and then show more verbose ways to do it.

#java #array #how to print an array in java #array in java #print an array in java #print 1620458875

## Going Beyond Java 8: Local Variable Type Inference (var) - DZone Java

According to some surveys, such as JetBrains’s great survey, Java 8 is currently the most used version of Java, despite being a 2014 release.

What you are reading is one in a series of articles titled ‘Going beyond Java 8,’ inspired by the contents of my book, Java for Aliens. These articles will guide you step-by-step through the most important features introduced to the language, starting from version 9. The aim is to make you aware of how important it is to move forward from Java 8, explaining the enormous advantages that the latest versions of the language offer.

In this article, we will talk about the most important new feature introduced with Java 10. Officially called local variable type inference, this feature is better known as the **introduction of the word **`var`. Despite the complicated name, it is actually quite a simple feature to use. However, some observations need to be made before we can see the impact that the introduction of the word `var` has on other pre-existing characteristics.

#java #java 11 #java 10 #java 12 #var #java 14 #java 13 #java 15 #verbosity 1621096440

## Functions for Strings in Java

In this tutorial, you will learn how to make better use of built-in functions for Strings in Java to program more quickly, effectively, and aesthetically.

### What Is a String?

Firstly, of course, we have to initialize our string. What is a string used for?

• You want to look at your string as a line, not as a mass of symbols.
• If you have a long text, you want to work with the words, not the letters.
• If you have lots of information, you need functions that solve questions as quickly as possible.

#java #tutorial #java strings #java tutorial for beginners #java string #string tutorial 1624070700

## How to Declare and Initialize an Array in Java

#### Introduction

In this tutorial, we’ll take a look at how to declare and initialize arrays in Java.

We declare an array in Java as we do other variables, by providing a type and name:

``````int[] myArray;
``````

To initialize or instantiate an array as we declare it, meaning we assign values as when we create the array, we can use the following shorthand syntax:

``````int[] myArray = {13, 14, 15};
``````

Or, you could generate a stream of values and assign it back to the array:

``````int[] intArray = IntStream.range(1, 11).toArray();
int[] intArray = IntStream.rangeClosed(1, 10).toArray();
int[] intArray = IntStream.of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10).toArray();
``````

To understand how this works, read more to learn the ins and outs of array declaration and instantiation!

#java #how to declare and initialize an array in java #array in java #assign #declare #declare and initialize an array in java