Loop through the items of a HashMap with a for-each loop.
Note: Use the keySet() method if you only want the keys, and use the values() method if you only want the values: Continue reading Java How To Loop Through a HashMap
Loop through the elements of an ArrayList:
public class Main {
public static void main(String[] args) {
ArrayList<String> cars = new ArrayList<String>();
cars.add("Volvo");
cars.add("BMW");
cars.add("Ford");
cars.add("Mazda");
for (String i : cars) {
System.out.println(i);
}
}
}
Create a program that finds the lowest age among different ages:
// An array storing different ages
int ages[] = {20, 22, 18, 35, 48, 26, 87, 70};
// Create a 'lowest age' variable and assign the first array element of ages to it
int lowestAge = ages[0];
// Loop through the elements of the ages array to find the lowest age
for (int age : ages) {
// Check if the current age is smaller than the current 'lowest age'
if (lowestAge > age) {
// If the smaller age is found, update 'lowest age' with that element
lowestAge = age;
}
}
// Output the value of the lowest age
System.out.println("The lowest age in the array is: " + lowestAge);Continue reading Java How To Find the Smallest Element in an Array
Create a program that calculates the average of different ages:
// An array storing different ages
int ages[] = {20, 22, 18, 35, 48, 26, 87, 70};
float avg, sum = 0;
// Get the length of the array
int length = ages.length;
// Loop through the elements of the array
for (int age : ages) {
sum += age;
}
// Calculate the average by dividing the sum by the length
avg = sum / length;
// Print the average
System.out.println("The average age is: " + avg);
Continue reading Java How To Find the Average of Array Elements
You can use the sort() method, found in java.util.Arrays, to sort an array:
import java.util.Arrays; public class Main { public static void main(String[] args) { String[] cars = {"Volvo", "BMW", "Tesla", "Ford", "Fiat", "Mazda", "Audi"}; Arrays.sort(cars); for (String i : cars) { System.out.println(i);}}}
There are many ways to convert a string to an array. The simplest way is to use the toCharArray() method:
Convert a string to a char array:
// Create a string
String myStr = "Hello";
// Convert the string to a char array
char[] myArray = myStr.toCharArray();
// Print the first element of the array
System.out.println(myArray[0]);You can also loop through the array to print all array elements:
// Create a string
String myStr = "Hello";
// Convert the string to a char array
char[] myArray = myStr.toCharArray();
// Print array elements
for (char i : myArray) {
System.out.println(i);
}Get the sum of array elements:
int[] myArray = {1, 5, 10, 25}; int sum = 0; int i; // Loop through the array elements and store the sum in the sum variable for (i = 0; i < myArray.length; i++) { sum += myArray[i];}System.out.println("The sum is: " + sum);
You can easily reverse a string by characters with the following example:
String originalStr = "Hello";
String reversedStr = "";
for (int i = 0; i < originalStr.length(); i++) {
reversedStr = originalStr.charAt(i) + reversedStr;
}
System.out.println("Reversed string: "+ reversedStr);You can easily count the number of words in a string with the following example:
String words = "One Two Three Four";
int countWords = words.split("\\s").length;
System.out.println(countWords);Learn how to add two numbers in Java:
int x = 5;
int y = 6;
int sum = x + y;
System.out.println(sum); // Print the sum of x + y