In this example, we can see the class Person and we use stream’s sorted() method to sort the list of people by their age. So in order for sorted() to work, it needs to have a natural order. For this reason, we have to implement the Comparable interface for the class which needs to be … Read more
Here are 3 ways to find the maximum number inside a list with lambda in Java:
There is a very important method indexOf which is part of the List interface. The description in Java documentation states: “Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element. More formally, returns the lowest index i such that (o==null ? get(i)==null : o.equals(get(i))), or … Read more
Let’s see the String lines method in Java. After Java 11 there is a new method String.lines(), which is useful if you have a multi-line string and you need to process each line. Definition of the method: Example on how to use it:
In this program, you can see Java 17 multi-string (inputMessage) creating BufferedReader to read the user input (System.in). The user input inside the do-while loop will be checked and repeated until the user writes exit. For every input 1, 2, or 3 there is an specific output, but for other user inputs we get the … Read more
To capture input from console in Java program you have several options. Two of the most commons ones are to use Scanner (java.util.Scanner) or BufferedReader (java.io.BufferedReader). Both of them are using System.in (standard input stream) to capture the keyboard input. ⚠ One thing to consider is that both classes Scanner and BufferedReader implement Closeable (java.io.Closeable). … Read more
