ip address

public class array

{

   public static void main (String args[])

    {

int nilai []=new int[3];

 nilai[0]=70; nilai[1]=80;

nilai[2]=65;

double ratarata=0.0;

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

ratarata+=nilai[i];

ratarata/=nilai.length;

System.out.println("Nilai rata-rata = " + ratarata);

 }

 }



import java.text.NumberFormat;

public class array2

{

 public static void main(String args[])

 {

NumberFormat nf=NumberFormat.getInstance();

nf.setMaximumFractionDigits(3);

int nilai[][]=new int[2][3];

nilai[0][0]=85;

nilai[0][1]=81;

 nilai[0][2]=78;

 nilai[1][0]=65;

 nilai[1][1]=73;

 nilai[1][2]=71;

 String MK[]={"RPL", "PBO"};

 double ratarataMK[]=new double[nilai.length];

 for (int i=0; i<nilai.length; i++)

 {

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

 {

 ratarataMK[i]+=nilai[i][j];

 }

 ratarataMK[i]/=nilai[0].length;

 }

 System.out.println("Nilai Mata Kuliah\n");

 System.out.println("MK\tMinggu\tMinggu2\tMinggu3\t Rata-rata");

 for (int i=0; i<nilai.length; i++)

 {

 System.out.println(MK[i] + "\t");

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

 {

 System.out.print(nilai[i][j] + "\t");

 }

 System.out.print(nf.format(ratarataMK[i])+"\n");

 }           

 }

 }



public class array2

{

public static void main(String args[])

                {

int x[][][][]=new int[2][][][];

                                x[0]=new int [1][][];

                                x[0][0]=new int[2][];

                                x[0][0][0]=new int[3];

                                x[0][0][1]=new int[2];

                                x[1]=new int[2][][];

                                x[1][0]=new int[1][];

                                x[1][0][0]=new int [2];

                                x[1][1]=new int[2][];

                                x[1][1][0]=new int[1];

                                x[1][1][1]=new int[3];

                                System.out.println(x.length);

                                System.out.println(x[0].length);

                                System.out.println(x[0][0].length);

                                System.out.println(x[0][0][0].length);

                                System.out.println(x[0][0][1].length);

                                System.out.println();

                                System.out.println(x[1].length);

                                System.out.println(x[1][0].length);

                                System.out.println(x[1][0][0].length);

                                System.out.println(x[1][1].length);

                                System.out.println(x[1][1][0].length);

                                System.out.println(x[1][1][1].length);    } }          

Pernyataan if

Menyatakan bahwa pernyataan akan dieksekusi jika memenuhi kondisi yang ditentukan

public class PernyataanIf

{

public static void main (String[ ] args)

                {

int nilai = 70;                       // pendefinisian variabel

if (nilai >= 60)

System.out.println ("Nilai = " + nilai + "      Lulus ujian");

}

}

Input data

Contoh dibawah menunjukkan penggunaan input data mlalui keyboard dengan kelas JOptionPane . Input diterima dari kotak dialog dalam bentuk string.Untuk konversi srting menjadi interger diperlukan metode Integer.parseInt().

public class PernyataanIfIn

{ 

                public static void main (String[] args)

                {      

                                int nilai;

                                String bilangan = JOptionPane.showInputDialog("Masukkan nilai:");    

                                System.out.println("Input angka: " + bilangan);

                                nilai = Integer.parseInt(bilangan);

                                if (nilai >= 60)

                                System.out.println ("Nilai = " + nilai + "      Lulus Ujian");       

                                System.exit(0); 

                 }

}



If bersarang

Contoh : Seseorang dapat diterima sebagai karyawan apabila umur paling banyak 30 tahun dan berpendidikan sarjana.

public class PernyataanIfNested

{

                public static void main (String[ ] args)

                {

                                int umur = 28;                    // pendefinisian variabel

                                String pendidikan = "sarjana";

                                System.out.println ("Umur = " + umur);

                                System.out.println ("Pendidikan = " + pendidikan);                        

                              

                if (umur <= 30);

                                                {

                                                if (pendidikan == "sarjana")

                                                System.out.println ("Diterima menjadi karyawan");

                                                }

                }

}



Pernyataan if-else

public class PernyataanIfelse

{

                public static void main (String[ ] args)

                {

int pembelian = 110;                       // pendefinisian variabel

                                System.out.println ("Jumlah pembelian = " + pembelian);                                                                            if (pembelian >= 100)

System.out.println ("Diskon = 20%");

                                Else

System.out.println ("Diskon = 5%");                                      

                }

}

If-else yang melibatkan if kedua ketiga dst

public class PernyataanIfelsen

{

public static void main (String[ ] args)

{

int nilai;                                // pendefinisian variabel

nilai = 75;

System.out.println ("Nilai =  " + nilai);

if (nilai >= 80)

System.out.println ("Predikat A");

else if (nilai >= 69)

System.out.println ("Predikat B");

else if (nilai >= 56)

System.out.println ("Predikat C");

else if (nilai >= 40)

System.out.println ("Predikat D");         

else

System.out.println ("Predikat E");          

}

}





Contoh  4

import java.util.Scanner;

public class input_05

{

                public static void main(String[] args)

                {

                                Scanner Sa = new Scanner(System.in);



                                System.out.print("Npm          : "); String npm = Sa.nextLine();

                                System.out.print("Nama         : "); String nm = Sa.nextLine();

                                System.out.print("Mata Kuliah  : "); String mk = Sa.nextLine();

                                System.out.print("Nilai        : "); int nilai = Sa.nextInt();

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

                                System.out.println("NPM                 : "+npm);

                                System.out.println("Nama                : "+nm);

                                System.out.println("Mata Kuliah     : "+mk);

                                System.out.println("Nilai                 : "+nilai);

                }

}



: Input Data String

import java.io.*;

class InputString {

public static void main(String[] args) throws IOException {

String nama;

InputStreamReader isr = new InputStreamReader(System.in);

BufferedReader br = new BufferedReader(isr);

System.out.print("Masukkan nama Anda: "); 

nama = br.readLine();

System.out.println("Hallo " + nama + ", sudahkah Anda mengerti Java?");    }}     



Contoh 3 : Input Data Numerik

import java.io.*;

class InputNumerik1 { 

public static void main(String[] args) throws IOException {

System.out.print("Masukkan sebuah bilangan bulat: ");

String temp;

int bilangan = 0;

InputStreamReader isr = new InputStreamReader(System.in);

BufferedReader br = new BufferedReader(isr);

// input data dianggap sebagai string

temp = br.readLine();

try {

// konversi dari string ke integer

bilangan = Integer.parseInt(temp);

} catch (NumberFormatException nfe) {

System.out.println("Data yang dimasukkan " +

"bukan bilangan bulat");

System.exit(1);

}

System.out.println("Bilangan yang dimasukkan " + "adalah " + bilangan);

}}









//PROGRAM IF TIGA KONDISI VARIASI 2

class Latihan_4_7

{

  public static void main(String[] args)

  {         

    char nilaiIndeks;

    double nilaiUTS, nilaiUAS, nilaiAkhir;

      

    // contoh data yang dimasukkan

    nilaiUTS = 75.0;

    nilaiUAS = 60.0;

      

    // menghitung nilai akhir menggunakan rumus di atas

    nilaiAkhir = (0.4 * nilaiUTS) + (0.6 * nilaiUAS);

    

    if (nilaiAkhir >= 80)

    {

      nilaiIndeks = 'A';

    }

    else if (nilaiAkhir >= 70)

    {       

      nilaiIndeks = 'B';

    }

    else if (nilaiAkhir >= 50)

    {       

      nilaiIndeks = 'C';

    }

    else if (nilaiAkhir >= 30)

    {       

      nilaiIndeks = 'D';      

    }

    else

    {    // (nilaiAkhir < 30)

      nilaiIndeks = 'E';

    }

    System.out.println("Nilai Akhir\t: " + nilaiAkhir);

    System.out.println("Nilai Indeks\t: " + nilaiIndeks);         

  }

}



//PROGRAM IF TIGA KONDISI VARIASI 1

class Latihan_4_6

{

  public static void main(String[] args)

  {         

    int bilangan = 4;

      

    if (bilangan < 0)

    {

      System.out.println(bilangan + " merupakan bilangan NEGATIF.");

    }

    else if (bilangan == 0)

    {       

      System.out.println("Nilai yang dimasukkan adalah NOL");

    }

    else

    { // (bilangan > 0)

      System.out.println(bilangan + " merupakan bilangan POSITIF.");      }                                   

  }

}

//PROGRAM 3-1 : Aritmetika Dasar

class Latihan_3_1

{

  public static void main(String[] args)

  {                   

    System.out.println("Operasi aritmetika " + "pada tipe integer");

    int a = 2 + 1;

    int b = a - 1;

    int c = a * b;

    int d = c / 3;

    int e = -a;

    System.out.println("Nilai a: " + a);

    System.out.println("Nilai b: " + b);

    System.out.println("Nilai c: " + c);

    System.out.println("Nilai d: " + d);

    System.out.println("Nilai e: " + e);

    System.out.println();

          

    System.out.println("Operasi aritmetika " + "pada tipe floating-point");

    double fa = 2 + 1;

    double fb = fa - 1;

    double fc = fa * fb;

    double fd = fc / 3;

    double fe = -a;

    System.out.println("Nilai fa: " + fa);

    System.out.println("Nilai fb: " + fb);

    System.out.println("Nilai fc: " + fc);

    System.out.println("Nilai fd: " + fd);

    System.out.println("Nilai fe: " + fe);          

  }

}



//PROGRAM 3-2 : Modulus

class Latihan_3_2

{

  public static void main(String[] args)

  {                   

    int a=11, b=4;

    int c = a % b;



    double da = 13.75;      

    double dc = da % b;



    System.out.println("Sisa bagi " + a + "/" + b + " adalah " + c);

    System.out.println("Sisa bagi " + da + "/" + b + " adalah " + dc);

  }



//PROGRAM 3-3 : Increment

class Latihan_3_3

{

  public static void main(String[] args)

  {                   

    int a=5;

          

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

    System.out.println("a\t: " + a);

    System.out.println("++a\t: " + ++a);

    System.out.println("a\t: " + a);

          

    int b=5;

          

    System.out.println("\nPost-increment");

    System.out.println("b\t: " + b);

    System.out.println("b++\t: " + b++);

    System.out.println("b\t: " + b);                

  }

}



//PROGRAM 3-6 : Operator Logika

class Latihan_3_6

{   

  public static void main(String[] args)

  {

                      

    System.out.println("Operasi AND");

    System.out.println("true && true   = " + (true && true));

    System.out.println("true && false  = " + (true && false));

    System.out.println("false && true  = " + (false && true));

    System.out.println("false && false = " + (false && false));

          

    System.out.println("\nOperasi OR");

    System.out.println("true || true   = " + (true || true));

    System.out.println("true || false  = " + (true || false));

    System.out.println("false || true  = " + (false || true));

    System.out.println("false || false = " + (false || false));

          

    System.out.println("\nOperasi XOR");

    System.out.println("true ^ true    = " + (true ^ true));

    System.out.println("true ^ false   = " + (true ^ false));

    System.out.println("false ^ true   = " + (false ^ true));

    System.out.println("false ^ false  = " + (false ^ false));

          

    System.out.println("\nOperasi NOT");

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

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

  } 

}





//PROGRAM 3-5 : Relasional

class Latihan_3_5

{

  public static void main(String[] args)

  {                   

    int a=5, b=10;          



    System.out.println("a == b bernilai " + (a == b));

    System.out.println("a != b bernilai " + (a != b));

    System.out.println("a > b bernilai " + (a > b));

    System.out.println("a < b bernilai " + (a < b));

    System.out.println("a >= b bernilai " + (a >= b));

    System.out.println("a <= b bernilai " + (a <= b));          

  }

}















public class Boolean1

{

public static void main (String [] args)

      {

boolean b;

b = true;

System.out.println ("Nilai b = " +b);

if (b)

{

System.out.println("Statemen ke-1 dieksekusi");

}

b = false;

System.out.println("Nilai b = " +b);

if (b)

{

System.out.println("Statemen ke-2 tidak dieksekusi");

}

if (!b)

{

System.out.println("Statemen ke-3 dieksekusi");

}

System.out.println ("5 <= 10 mengembalikan nilai = " + (5 <= 10));

System.out.println("4 > 6 mengembalikan nilai " + (4 > 6));

}

}











import java.io.*;

public class java0142

{

      public static void main(String[]args)throws IOException

      {

            for(int a=0;a<5;a++)

            {

            double ahir;

            char huruf;

            int UAS,UTS;

            String nim,nama,fak,progdi,uas,uts;

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

            System.out.print ("Masukkan NIM                                   : ");

            nim=br.readLine();

            System.out.print ("Masukkan Nama                                : ");

            nama=br.readLine();

            System.out.print ("Masukkan Fakultas                : ");

            fak=br.readLine();

            System.out.print ("Masukkan Program Studi                   : ");

            progdi=br.readLine();

            System.out.print ("Masukkan Nilai UTS               : ");

            uts=br.readLine();

            System.out.print ("Masukkan Nilai UAS              : ");

            uas=br.readLine();

            UTS=Integer.parseInt(uts);

            UAS=Integer.parseInt(uas);

            ahir=UTS*0.4+UAS*0.6;

                  if (ahir>100){huruf='X';

                  }else if (ahir>=80){huruf='A';

                  }else if (ahir>=71){huruf='B';

                  }else if (ahir>=61){huruf='C';

                  }else if (ahir>=51){huruf='D';

                  }else {huruf='E';

                  }

                  System.out.println(" ");                   

                  System.out.println("***###***###***###*** Nilai Anda ***###***###***###***");             

                  System.out.println("NIM                               :"+nim);

                  System.out.println("Nama                            :"+nama);

                  System.out.println("Fakultas                        :"+fak);

                  System.out.println("Program Studi               :"+progdi);

                  System.out.println("Nilai UTS                       :"+UTS);

                  System.out.println("Nilai UAS                       :"+UAS);

                  System.out.println("Nilai Angka                    :"+ahir);

                  System.out.println("Nilai Huruf                      :"+huruf);

                  System.out.println("**** program oleh : 10.01.53.0110 Rochmad ***");

                  System.out.println(" ");       

            }

      }               

}



import java.io.*;

class persegi

{

  public static void main (String[]arg) throws IOException

  {

int p,l;

String nama, nim;

double luas, keliling;

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

System.out.print("Masukkan Nama                 :");nama= br.readLine();

System.out.print("Masukkan NIM                  :");nim= br.readLine();

System.out.print("Masukkan nilai panjang:");p=Integer.parseInt(br.readLine());

System.out.print("Masukkan nilai lebar :");l=Integer.parseInt(br.readLine());

        luas=p*l;

        keliling=p+p+l+l;

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

        System.out.println("Nama                  :"+nama);

        System.out.println("Nim                   :"+nim);

        System.out.println("Nilai panjang   :"+p);

        System.out.println("Nilai Lebar           :"+l);

        System.out.println("Luas                  :"+luas);

        System.out.println("Keliling        :"+keliling);

              if(p==l)

        {

              System.out.println("Jenis Bangunan  :Perasegi");

        }

        else

        {

              System.out.println("Jenis Bangunan  :Bukan persegi");

        }

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

  }

}









Mengakses elemen array

public class array

{



    public static void main (String args[])

    {

        int nilai []=new int[3];

        nilai[0]=70; nilai[1]=80;

        nilai[2]=65;

        double ratarata=0.0;

      

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

              ratarata+=nilai[i];

              ratarata/=nilai.length;

              System.out.println("Nilai rata-rata = " + ratarata);

    }



}

Nah ! selebihnya ya seperti ini kalau ada kekurangannya tolong dilengkapi OK.