Input Numeric

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);

                               

                                temp = br.readLine();

                               

                                try

                                {

                                                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);

                }

}

input data ke dlm txt

import java.io.*;

class FileOutputDemo {

Penggunaan Class

class kotak {
  double panjang,lebar,tinggi;
}
class contohclass1 {
  public static void main(String[] args) {
    double volume;
    kotak k = new kotak();
  
    k.panjang=10;
    k.lebar=3;
    k.tinggi=4;
   
    volume = k.panjang * k.lebar * k.tinggi;
   
    System.out.println("Volume Kotak : " + volume);
  }
}   
 

Aritmatika

class aritmatika
{
 public static void main (String[] args)
 {
 int a = 10;
 int b = 20;

 int c = a + b;

 System.out.println(a);
 System.out.println(b);
 System.out.println(c);
 }
}

Input String

import java.io.*;

class latihanstring {

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

                                String nama, alamat, notelp;

                                InputStreamReader isr = new InputStreamReader (System.in);

                                BufferedReader tampung = new BufferedReader (isr);

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

                                nama = tampung.readLine();

                                System.out.print("Masukkan alamat anda: ");

                                alamat = tampung.readLine();

                                System.out.print("Masukkan no telp anda: ");

                                notelp = tampung.readLine();

                               

                                System.out.println("\n----IDENTITAS ANDA----");

                                System.out.println("Nama Anda adalah \t : " + nama);

                                System.out.println("Alamat Anda adalah \t : " + alamat);

                                System.out.println("No telp Anda adalah \t : " + notelp);

                }

}

Perhitungan balok

import java.io.*;

class balok {

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

                               

                                InputStreamReader isr = new InputStreamReader (System.in);

                                BufferedReader br = new BufferedReader (isr);

                               

                                System.out.print("Masukkan lebar balok: ");

                                String lebarStr = br.readLine();

                                int lebar = Integer.parseInt(lebarStr);

                               

                                System.out.print("Masukkan panjang balok: ");

                                String panjangStr = br.readLine();

                                int panjang = Integer.parseInt(panjangStr);

                               

                                System.out.print("Masukkan tinggi balok: ");

                                String tinggiStr = br.readLine();

                                int tinggi = Integer.parseInt(tinggiStr);

               

                                int volume = panjang * lebar * tinggi;

                               

                                System.out.println("\nVolume balok adalah : ");

                                System.out.println(volume);

                                System.out.println(" meter kubik\n");

                }

}

Perhitungan balok

import java.io.*;

class balok {

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

                               

                                InputStreamReader isr = new InputStreamReader (System.in);

                                BufferedReader br = new BufferedReader (isr);

                               

                                System.out.print("Masukkan lebar balok: ");

                                String lebarStr = br.readLine();

                                int lebar = Integer.parseInt(lebarStr);

                               

                                System.out.print("Masukkan panjang balok: ");

                                String panjangStr = br.readLine();

                                int panjang = Integer.parseInt(panjangStr);

                               

                                System.out.print("Masukkan tinggi balok: ");

                                String tinggiStr = br.readLine();

                                int tinggi = Integer.parseInt(tinggiStr);

               

                                int volume = panjang * lebar * tinggi;

                               

                                System.out.println("\nVolume balok adalah : ");

                                System.out.println(volume);

                                System.out.println(" meter kubik\n");

                }

}