Java Fundamentals Review -18 (Math class, arrays class and big data operations)

 Public classMathdemo { Public Static voidMain (string[] args) {Doublex=12.2; //take absolute valueSystem.out.println (Math.Abs (-99)); //Rounding upSystem.out.println (Math.ceil (x)); //Rounding downSystem.out.println (Math.floor (x)); //Take maximum valueSystem.out.println (Math.max (2,5)); //take the minimum valueSystem.out.println (Math.min (2,5)); //Take powerSystem.out.println (Math.pow (2,3)); //fetch random number [0,1]System.out.println (Math.random ()); //RoundingSystem.out.println (Math.Round (12.6)); System.out.println (Math.Round (12.5)); System.out.println (Math.Round (12.4)); //πSystem.out.println (Math.PI); }

Importjava.util.Arrays; Public classArraysdemo { Public Static voidMain (string[] args) {method2 (); }     Public Static voidmethod1 () {int[] arr={3,6,9,11,15}; //returns the index value for the specified value in an ordered array. //specified value if not present, index value = (-current index-1)        intI=arrays.binarysearch (arr, 6);    System.out.println (i); }         Public Static voidmethod2 () {//sort the array in ascending order        int[] arr={5,7,1,6,3,2,9};        Arrays.sort (arr);        System.out.println (arrays.tostring (arr));  for(intA:arr) {System.out.print (a+" "); }    }}

import Java.math.BigInteger;

Public classBigdemo { Public Static voidMain (String[]args) {BigInteger B1=NewBigInteger ("10000000000000000000000000000000000"); BigInteger B2=NewBigInteger ("20000000000000000000000000000000000"); //additionSystem.out.println (B1.add (B2)); //SubtractionSystem.out.println (B1.subtract (B2)); //multiplicationSystem.out.println (b1.multiply (B2)); //DivisionSystem.out.println (B1.divide (B2)); }}

Import Java.math.bigdecimal;public class Bigdecimaldemo {public static void main (string[] args) {method1 (); Method2 (); me Thod3 (); METHOD4 ();} public static void Method1 () {//For the purpose of avoiding loss accuracy with BigDecimal compute addition BigDecimal bd1=new BigDecimal ("0.09"); BigDecimal bd2=new BigDecimal ("0.01"); System.out.println (Bd1.add (BD2));} public static void Method2 () {//For the purpose of avoiding loss accuracy, use BigDecimal to calculate subtraction BigDecimal bd1=new BigDecimal ("1.0"); BigDecimal bd2=new BigDecimal ("0.32"); System.out.println (Bd1.subtract (BD2));} public static void Method3 () {//For the purpose of avoiding loss accuracy multiply BigDecimal bd1=new BigDecimal ("1.02") with BigDecimal; BigDecimal bd2=new BigDecimal ("0.32"); System.out.println (Bd1.multiply (BD2));} public static void Method4 () {//Calculates division BigDecimal bd1=new BigDecimal ("1.0") with BigDecimal to avoid loss accuracy; BigDecimal bd2=new BigDecimal ("0.3"); System.out.println (Bd1.divide (bd2,bigdecimal.round_floor,3));}}

Java Fundamentals Review -18 (Math class, arrays class and big data operations)