Dasar-dasar Pemograman Java

1.       Buatlah program menampilkan bilangan 1-20

Program

package bilangan120;

public class Main {

    public static void main(String[] args) {

        int i;

        for (i= 1;i <= 20; i++)

            System.out.println(+i);

    }

}

Hasil

 

 

2.       Buatlah program menghitung jumlah 1-20

Program

package jumlah120;

public class Main {

    public static void main(String[] args) {

    int n=20;

    int hasil=0;

    int i=1;

    while (i<=n) {

      System.out.print(i);

      if (i != n) {

        System.out.print(" + ");

      } else {

        System.out.print(" = ");

      }

      hasil += i;

      i++;

    }

    System.out.println(hasil);

    }

}

Hasil

3.  Buatlah program menghitung N faktorial

Program

package faktorial;

import java.util.Scanner;

public class Main {

  

    public static void main(String[] args) {

         Scanner s=new Scanner(System.in);

        System.out.println("===========FAKTORIAL============");

        System.out.print("Input sebuah bilangan (N) = ");

        int n=s.nextInt();

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

        System.out.print("Penyelesaian faktorial\n" + n + "!");

                int b=1;

        if(n>0){

            for(int i=1;i<n;i++)

            b=b*(n-i);

            b=b*n;

           

        }

        else

            b=1;

        System.out.println(" = "+b);

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

    }

}

Hasil

 

4.       Program menghitung potongan harga barang

Program

package potonganharga;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

       Scanner masuk=new Scanner(System.in);

       int harsat,judib,voucher;

       String nambar;

       double total,jlh_bayar;

       double diskon;

       System.out.print("masukkan nama barang yang dibeli         :");

       nambar=masuk.next();

       System.out.print("\n");

       System.out.print("harga satuan yang dibeli                 :");

       harsat=masuk.nextInt();

       System.out.print("\n");

       System.out.print("jumlah yang dibeli                       :");

       judib=masuk.nextInt();

       total=harsat*judib;

       System.out.print("\n");

       System.out.println("total belanja anda                       :"+total);

       System.out.print("\n");

       if(total>1000000)

       {

           diskon = total * 0.1;

           System.out.println("anda mendapat diskon                     :"+diskon);

           System.out.print("\n");

           System.out.println("anda mendapat voucher belanja            :100000");

           System.out.print("\n");

           jlh_bayar=total-diskon;

           System.out.println("total belanja yang anda bayar            :"+jlh_bayar);

           System.out.print("\n");

       }

       else if(total>=500000&&total<=1000000)

       {

           diskon=total*0.05;

           System.out.println("anda mendapat diskon                     :"+diskon);

           System.out.print("\n");

           System.out.println("anda mendapat voucher belanja            :100000");

           System.out.print("\n");

           jlh_bayar=total-diskon;

           System.out.println("total belanja yang anda bayar            :"+jlh_bayar);

           System.out.print("\n");

       }

       else

       {

           diskon=total*0;

           System.out.println("anda mendapat diskon                     :"+diskon);

           System.out.print("\n");

           System.out.println("anda tidak mendapat voucer belanja");

           System.out.print("\n");

           jlh_bayar=total-diskon;

           System.out.println("total belanja yang anda bayar            :"+jlh_bayar);

           System.out.print("\n");

       }

   }

}

Hasil

 

5.   Program menampilkan bilangan prima dari N buah data

Program

package menampilkanbilanganprima;

import java.util.Scanner;

public class Main {

   

    public static void main(String[] args) {

       Scanner input = new Scanner(System.in);

      

        boolean isPrima;

        int x = 2;

        int count = 1;

      

        System.out.print("Masukkan banyak angka = ");

        int angka = input.nextInt();

       System.out.print("Bilangan Prima        = ");

        while(count <= angka){

            isPrima=false;

            if(x == 2 || x == 3 || x == 5){

                isPrima = true;

            }

            else if(x % 2 != 0){

                if(x % 3 != 0){

                    if(x % 5 != 0){

                        isPrima = true;

                    }

                }

            }

            if(isPrima==true){

                System.out.print(x+" ");

                count++;

            }

            x++;

        }

        

        System.out.println("\n");

    }

}

Hasil

 

 

6.   Pengurutan data

Program

package pengurutandata;

import java.util.Scanner;

public class Main {

  

    public static void main(String[] args) {

        int jmlInput;

        int bilangan;

        int min;

        int temp;

        int tempat = 0;

        System.out.print("Masukan jumlah bilangan yg diinputkan : ");

        Scanner s = new Scanner(System.in);

        jmlInput = s.nextInt();

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

        final int ARRAY_SIZE = (jmlInput+2);

        int []arrayBil = new int[ARRAY_SIZE];

        System.out.print("Bilangan ke 1 : ");

        bilangan = s.nextInt();

        arrayBil[0] = bilangan;

        for( int x=1; x<jmlInput; x++){

            System.out.print("Bilangan ke "+(x+1)+" : ");

            bilangan = s.nextInt();

            arrayBil[x] = bilangan;

        }

        for(int i=0; i<=jmlInput; i++ )

        {

            min = arrayBil[i];

            for(int j=i; j<=jmlInput; j++){

                if(arrayBil[j]<=min){

                    min = arrayBil[j];

                    tempat=j;

                }

            }

            temp = arrayBil[i];

            arrayBil[i] = arrayBil[tempat] ;

            arrayBil[tempat] = temp;

        }

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

        System.out.print("Nilai setelah diurutkan : ");

        for(int i=1; i<=jmlInput; i++){

            System.out.print(""+arrayBil[i]+", ");

        }

        System.out.println(" ");

    }

}

Hasil

 

1.       Program segitiga pascal

Program

package segitigapascal;

import java.util.Scanner;

public class Main {

 

    public static void main(String[] args) {

        int a,x,y;

        Scanner input = new Scanner(System.in);

        System.out.print("Masukan tinggi segitiga : ");

        a = input.nextInt();

        int[][]b = new int[100][100];

        for(x=1; x<=a; x=x+1){

            for(y=a; y>x; y=y-1){

                System.out.print("   ");

            }

            for(y=1; y<=x; y++){

                if(x==0||y==x){

                    b[x][y]=1;

                    System.out.print("  "+b[x][y]+"   ");

                }

                else{

                    b[x][y] = b[x-1][y-1] + b[x-1][y];

                    if(b[x][y]>99)

                        System.out.print("  "+b[x][y]+" ");

                    else if(b[x][y]>9)

                        System.out.print("  "+b[x][y]+"  ");

                    else

                        System.out.print("  "+b[x][y]+"   ");

                }

            }

            System.out.println();

        }

        

        }       

    }

Hasil