Patterns are most important for interview point of view. To understand pattern problem you know only the basic tactic of how to solve pattern problem. In Java, it becomes a little bit easier to code patterns problems. In this article we discuss 20 basic pattern problem in java. Java Program: To Check If A Number Is Prime In Java Lets get start :) Patterns In Java 1. Left Triangle Star Pattern : First, let us begin with the basic and the commonly asked pattern program in Java i.e This is the basic pattern in java to write its code . Their is only two loops are used one for row and another for column. Let’s write the java code: import java.util.*; public class Main { public static void main(String[] args) { Scanner scn = new Scanner(System.in); // write ur code here int n = scn.nextInt(); for (int i = 1; i <= n; i++){ for(int j = 1; j <= i; j++){ System.out.print("*\t