Belajar Program Java Sederhana

1. Menghitung Luas dan Keliling Lingkaran

import java.io.*;

public class menghitungLuasdanKeliling

{

public static void main (String args[])

{

try

{

int phi=22/7;

System.out.print(“jari2=”);

BufferedReader input1= new BufferedReader(new InputStreamReader(System.in));

String jari2=input1.readLine();

int r=Integer.parseInt(jari2);

int Luas=phi*r*r;

int Keliling=2*phi*r;

System.out.print(“Luas=”+Luas+”\n”+”Keliling=”+Keliling);

}

catch(IOException e)

{

}

}

}

Hasil Eksekusi Luas dan Keliling

2.    Konversi Fahrenheit ke Celcius dan Reamur

import javax.swing.*;

public class konversiFahrenheit

{

public static void main (String args[])

{

String input=JOptionPane.showInputDialog(“masukkan fahrenheit”);

int TF=Integer.parseInt(input);

System.out.println(“Fahrenheit=”+TF);

int TC=5*(TF-32)/9;

int TR=TC*4/5;

System.out.println(“Celcius=”+TC+”\n”+”Reamur=”+TR);

System.exit(0);

}

}

Hasil Eksekusi Konversi

TUGAS PRAKTIKUM 2

1.    Hari-hari dalam satu minggu

public class hari

{

public static void main (String args[])

{

String []data ={“Senin”,”Selasa”,”Rabu”,”Kamis”,”Jumat”,”Sabtu”,”Minggu”};

for(int i=0;i<data.length;i++)

{

System.out.println(“Hari “+data[i]);

}

}

}

Hasil Eksekusi Hari

2.    Menentukan Bilangan Prima (0-1000)

public class prima

{

int[] bil=new int[1000];

public int[]inputdata()

{

for (int i=0; i<bil.length;i++)

{

bil[i]=i;

}

return bil;

}

public int[]cekprima()

{

int cek=0;

int[] data=new int[bil.length];

for (int i=0;i<bil.length;i++)

{

data [2]=2;

for (int j=2;j<bil[i];j++)

{

cek=(bil [i])%j;

if(cek==0)

break;

}

if (cek!=0)

data[i]=bil[i];

}

return data;

}

public void cetakprima(int[]cetak)

{

System.out.print (“Bilangan prima dari 0-1000:\n”);

for (int i=0; i<cetak.length; i++)

{

if (cetak[i]>0)

{

System.out.print (cetak[i]+” “);

}

}

System.out.println();

}

public static void main(String []args)

{

prima p =new prima();

p.inputdata();

p.cekprima();

p.cetakprima(p.cekprima());

}

}

Hasil Eksekusi Bilangan Prima (0-1000)

3. Menentukan bilangan prima/bukan dengan menginputkan angka dari Keyboard

            import java.io.*;

            public class primaViaKeyboard

            {

public static void main(String[] args)

{

BufferedReader dataIn = new BufferedReader(new

InputStreamReader(System.in));

int bil,pembagi = 2;

String chek = “”;

String numStr = “”;

System.out.print(“Masukkan bilangan : “);

try

{

numStr = dataIn.readLine();

}

catch( IOException e )

{

System.out.println(“Error!”);

}

bil = Integer.parseInt(numStr);

do

{

if (bil % pembagi ==0 || bil<=2)

{

chek = “BUKAN bilangan PRIMA”;

break;

}

if (pembagi>= bil/2 )

{

chek = “bilangan PRIMA”;

break;

}

pembagi++;

}

while (pembagi<=bil/2);

System.out.println(bil + ” adalah” +chek);

}

}

Hasil Eksekusi bilangan prima/bukan dengan menginputkan angka dari Keyboard

4.    Mencari rata-rata dari n bilangan

             import javax.swing.*;

             public class ratarata

{

public static void main (String args[])

{

System.out.println(“Data Yang Di Masukkan Melalui Keyboard:”);

String input1=JOptionPane.showInputDialog(“data 1: “);

int d1=Integer.parseInt(input1);

System.out.println(“data1: “+d1);

String input2=JOptionPane.showInputDialog(“data 2: “);

int d2=Integer.parseInt(input2);

System.out.println(“data2: “+d2);

String input3=JOptionPane.showInputDialog(“data 3: “);

int d3=Integer.parseInt(input3);

System.out.println(“data3: “+d3);

String input4=JOptionPane.showInputDialog(“data 4: “);

int d4=Integer.parseInt(input4);

System.out.println(“data4: “+d4);

String input5=JOptionPane.showInputDialog(“data 5: “);

int d5=Integer.parseInt(input5);

System.out.println(“data5: “+d5);

int ratarata = (d1+d2+d3+d4+d5)/5;

System.out.println(“nilai rata-rata=”+ratarata);

System.exit(0);

}

}

Hasil Eksekusi Mencari rata-rata dari n bilangan

TUGAS PRAKTIKUM 3

1.   Penjumlahan Matrik dengan menginputkan data dari keyboard

import javax.swing.*;

public class penjumlahanmatrik

{

public static void main (String args[])

{

System.out.println(“Data Yang Di Masukkan Melalui Keyboard:”);

String input1=JOptionPane.showInputDialog(“data 1: “);

int m1=Integer.parseInt(input1);

System.out.print(” “+m1);

String input2=JOptionPane.showInputDialog(“data 2: “);

int m2=Integer.parseInt(input2);

System.out.print(” “+m2);

String input3=JOptionPane.showInputDialog(“data 3: “);

int m3=Integer.parseInt(input3);

System.out.print(” “+m3);

String input4=JOptionPane.showInputDialog(“data 4: “);

int m4=Integer.parseInt(input4);

System.out.print(” “+m4);

String input5=JOptionPane.showInputDialog(“data 5: “);

int m5=Integer.parseInt(input5);

System.out.print(” “+m5);

String input6=JOptionPane.showInputDialog(“data 6: “);

int m6=Integer.parseInt(input6);

System.out.println(” “+m6);

String input7=JOptionPane.showInputDialog(“data 7: “);

int m7=Integer.parseInt(input7);

System.out.print(” “+m7);

String input8=JOptionPane.showInputDialog(“data 8: “);

int m8=Integer.parseInt(input8);

System.out.print(” “+m8);

String input9=JOptionPane.showInputDialog(“data 9: “);

int m9=Integer.parseInt(input9);

System.out.print(” “+m9);

String input10=JOptionPane.showInputDialog(“data 10: “);

int m10=Integer.parseInt(input10);

System.out.print(” “+m10);

String input11=JOptionPane.showInputDialog(“data 11: “);

int m11=Integer.parseInt(input11);

System.out.print(” “+m11);

String input12=JOptionPane.showInputDialog(“data 12: “);

int m12=Integer.parseInt(input12);

System.out.println(” “+m12);

int[][]matrik1={{m1,m2,m3},{m4,m5,m6}};

int[][]matrik2={{m7,m8,m9},{m10,m11,m12}};

int[][]jumlah=new int[matrik1.length][matrik1[0].length];

System.out.println(“data matrik1:”);

for(int i=0;i<matrik1.length;i++)

{

for(int j=0;j<matrik1[0].length;j++)

{

System.out.print( matrik1[i][j]+” “);

}

System.out.println();

}

System.out.println(“data matrik2:”);

for(int i=0;i<matrik2.length;i++)

{

for(int j=0;j<matrik2[0].length;j++)

{

System.out.print( matrik2[i][j]+” “);

}

System.out.println();

}

for (int i=0;i<jumlah.length;i++)

{

for (int j=0;j<jumlah[0].length;j++)

{

jumlah[i][j]=matrik1[i][j]+matrik2[i][j];

}

}

System.out.println(“hasil penjumlahan:”);

for (int i=0;i<matrik2.length;i++)

{

for (int j=0;j<matrik2[0].length;j++)

{

System.out.print(jumlah[i][j]+” “);

}

System.out.println();

}

System.exit(0);

}

}

Hasil Eksekusi Penjumlahan Matrik dengan menginputkan data dari keyboard

===================Selamat Belajar=================

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