Ayo Belajar Java lagi

Relasi Demo menggunakan input dari keyboard :

import java.util.Scanner;

public class Tugas2

{      

       public static void main(String args[])

       {

              Scanner input = new Scanner(System.in);

              int i;

              int j;

              int k;

              System.out.print( " Masukkan nilai i : ");

              i = input.nextInt();

              System.out.print( " Masukkan nilai j : ");

              j = input.nextInt();

              System.out.print( " Masukkan nilai k : ");

              k = input.nextInt();

              System.out.println("Variabel ...");

              System.out.println(" i = "+i);

              System.out.println(" j = "+j);

              System.out.println(" k = "+k);

      

              //bigger than

              System.out.println("Bigger than ...");

              System.out.println(" i>j = "+(i>j));//false

              System.out.println(" j>i = "+(j>i));//true

              System.out.println(" k>j = "+(k>j));//false

              //Bigger or equals

              System.out.println("Bigger or equals ...");

              System.out.println(" i>=j = "+(i>=j));//false

              System.out.println(" j>=i = "+(j>=i));//true

              System.out.println(" k>=j = "+(k>=j));//true

              //less than

              System.out.println("Less than .. ");

              System.out.println(" i<j = "+(i<j));//true

              System.out.println(" j<i = "+(j<i));//false

              System.out.println(" k<j = "+(k<j));//false

      

              //smaller or equals

              System.out.println("Smaller or equals ... ");

              System.out.println(" i<=j = "+(i<=j));//true

              System.out.println(" j<=i = "+(j<=i));//false

              System.out.println(" k<=j = "+(k<=j));//true

      

              //equal

              System.out.println("equal ... ");

              System.out.println(" i==j = "+(i==j));//false

              System.out.println(" k==j = "+(k==j));//true

              //not same as

              System.out.println("not same as ... ");

              System.out.println(" i!=j = "+(i!=j));//true

              System.out.println(" k!=j = "+(k!=j));//false

       }

}

Analisis Program

Program Tugas2 pada dasarnya sama dengan program Relsai Demo pada program III - 6, hanya yang membedakannya  pada variable pembanding, untuk Relasi Demo variable i, j, and k telah diinisialisasikan terlebih dahulu dengan nilai yang tetap, sedangkan pada Tugas2 variable i, j, dan k diinput memalui keyboard sesuai dengan keinginan user.

3. Program SumAverage

import java.util.Scanner;

public class SumAverage

{

       public static void main(String args[]){

              Scanner input = new Scanner(System.in);

              int x;

              int y;

              int z;

              int sum;

              float average;

              System.out.print("\n Program Penghitung Jumlah dan Rata-Rata\n ");        

              System.out.print("\n Masukan Nilai ke-1 : ");

              x = input.nextInt();

              System.out.print(" Masukan Nilai ke-2 : ");

              y = input.nextInt();

              System.out.print(" Masukan Nilai ke-3 : ");

              z = input.nextInt();

              sum = x+y+z;

              System.out.printf("\n Hasil Penjumlahan "+x+" + "+y+" + "+z+"\t= " +sum);

              average = (sum/3);

              System.out.println("\n Hasil Rata - Rata "+sum+" / 3\t= "+average);

       }

}

Analisis Program

Program SumAverage adalah program yang memiliki dua fungsi, yaitu penjumlahan dan rata-rata . Dengan menggunakan 3 variable yang diinput dari keyboard oleh user , program ini menjumlahkan dan menghitung rata-ratanya.

4. Program menggunakan BufferReader

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class Tugas4

{

       public static void main(String[] args)

       {

              BufferedReader dataIn = new BufferedReader (new InputStreamReader(System.in));

             

              String name="";

              System.out.print("\n Please Enter Your Name\t\t: ");

              try

                     {

                     name = dataIn.readLine();

                     }

              catch( IOException e )

                     {

                     System.out.println("Error!");

                     }

      

              String hobby="";

              System.out.print(" Please Enter Your Hobby\t: ");

              try

                     {     

                     hobby = dataIn.readLine();

                     }

                     catch( IOException e ){

                     System.out.println("Error!");

                     }

              System.out.println("\n So your hobby is "+hobby+". Nice hobby Mr. "+name+" !");

       }

}

Analisis Program

Program Tugas4 tersebut sama dengan Program GetinputFromKeyboard2, perbedaannya hanya terdapat pada penggunaan JOptionPane. Nama dan hobby diinput oleh user dari keyboard, kemudian ditampilkan menjani satu kalimat.

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