export enum TestStatus {
allCandidates,
completedTest,
expiredTest,
blockedTest
}
{
"TestStatus": "expiredTest"
}
Here is what the above code is Doing:
1. We are creating an enum called TestStatus.
2. We are defining four values for the enum: allCandidates, completedTest, expiredTest, blockedTest.
3. We are creating a variable called TestStatus and assigning it the value expiredTest.
import java.util.Collections; List myList = new ArrayList(); String[] myArray = new String[] {“Java”, “Util”, “List”}; Collections.addAll(myList, myArray); Here is what the above code is Doing: 1. Create a new ArrayList object and assign it to the variable myList. 2. Create a new String array object and assign it to the variable myArray. 3. Call the…
import java.util.TreeMap; public class RomanNumber { private final static TreeMap map = new TreeMap(); static { map.put(1000, “M”); map.put(900, “CM”); map.put(500, “D”); map.put(400, “CD”); map.put(100, “C”); map.put(90, “XC”); map.put(50, “L”); map.put(40, “XL”); map.put(10, “X”); map.put(9, “IX”); map.put(5, “V”); map.put(4, “IV”); map.put(1, “I”); } public final static String toRoman(int number) { int l = map.floorKey(number); if…
ArrayList arr=new ArrayList(10); Here is what the above code is Doing: 1. We are creating an ArrayList of type Integer. 2. We are passing the initial capacity of the ArrayList as 10. 3. We are creating an ArrayList of type Integer. 4. We are passing the initial capacity of the ArrayList as 10.
I solved it by upgrading my gradle dependency in the android/build.gradle file: classpath ‘com.android.tools.build:gradle:3.3.1′ (I was previously on version 3.2.1) Here is what the above code is Doing: 1. It’s creating a new instance of the class “MyReactPackage” 2. It’s adding the new instance to the list of other packages already included in the list.
String str = “java”; String cap = str.substring(0, 1).toUpperCase() + str.substring(1); // cap = “Java” Here is what the above code is Doing: 1. str.substring(0, 1) gets the first character of the string. 2. toUpperCase() makes it uppercase. 3. str.substring(1) gets the rest of the string. 4. + concatenates the two substrings together.
Best Java Cheat Sheet: https://introcs.cs.princeton.edu/java/11cheatsheet/ Here is what the above code is Doing: 1. We’re creating a class called “HelloWorld” 2. We’re creating a method called “main” 3. We’re printing out “Hello World!”