FileReader dan BufferedReader

import java.io.*;
 
public class BacaFileTeks {
	public void baca(String namaFile) {
		try {
			FileReader html = new FileReader(namaFile);
			BufferedReader baca = new BufferedReader(html);
 
			String lihat = "";
			int i = 0;
			char huruf = 'a';
 
			while ((lihat = baca.readLine()) != null) {
				for (i = 0; i < lihat.length(); i++) {
					huruf = lihat.charAt(i);
					System.out.print(huruf);
				}
			}
 
			baca.close();
 
		}
		catch (IOException e) {
			System.out.println("Error Dalam Membaca File");
		}
	}
}

public class Uji {
	public static void main (String[] args) {
		BacaFileTeks b = new BacaFileTeks();
		b.baca("D:\\Free.txt");
	}
}

java.util.Random

import java.util.Random;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
 
public class RanTA extends Applet {
	private int random, seek;
	private TextField t1, t2;
	private Button b1, b2;
	TebakAngka tA;
	Random ran;
 
	public void init() {
		random = 0; seek = 0;
 
		t1 = new TextField(40);
		t2 = new TextField(40);
 
		b1 = new Button("Random");
		b2 = new Button("Seek");
 
		ran = new Random();
 
		add(t1);
		add(b1);
		add(b2);
		add(t2);
 
		t2.setText("Tekan Tombol Random Untuk Mengacak Angka Dari 1 - 100");
 
		b1.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ae) {
				random = 1 + ran.nextInt(100);
				t2.setText("Silakan Tebak Dari 1 - 100");
				t1.setText("");
			}
		});
 
		b2.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ae) {
				seek = Integer.parseInt(t1.getText());
				tA = new TebakAngka(random, seek);
				t2.setText(tA.getNilai());
			}
		});
	}
}

public class TebakAngka {
	private int angka1;
	private int angka2;
 
	public TebakAngka (int angka1, int angka2) {
		this.angka1 = angka1;
		this.angka2 = angka2;		
	}
 
	public String getNilai() {
		String tampil = "";
 
		if (angka1 == angka2) {
			tampil = "Tebakan benar!";
		}
		else if (angka1 > angka2) {
			tampil = "Tebakan salah, harusnya lebih besar dari " + angka2;
		}
		else if (angka1 < angka2) {
			tampil = "Tebakan salah, harusnya lebih kecil dari " + angka2;
		}
 
		return tampil;
	}
}

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
 
public class TApplet extends Applet {
	private TextField t1, t2, t3;
	private Button b1, b2;
	private int hide, seek;
	private TebakAngka tA;
 
	public void init() {
		t1 = new TextField(40);
		t2 = new TextField(40);
		t3 = new TextField(40);
 
		b1 = new Button("Hide");
		b2 = new Button("Seek");
 
		add(t1);
		add(t2);
		add(b1);
		add(b2);
		add(t3);
 
		t3.setText("Masukkan sebuah angka dari 1 - 100, kemudian tekan Hide");
 
		b1.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ae) {
				hide = Integer.parseInt(t1.getText());
				t1.setText("");
				t2.setText("");
				t3.setText("Isikan sebuah angka, kemudian tekan Seek");
			}
		});
 
		b2.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ae) {
				seek = Integer.parseInt(t2.getText());
				tA = new TebakAngka(hide, seek);
				t1.setText(tA.getNilai());
			}
		});	
	}
}

<applet code="TApplet" width=320 height=240></applet>

import java.util.Scanner;
 
public class NilaiAkhir {
 public static void main(String[] args) {
  Scanner in = new Scanner(System.in);
 
  System.out.print("Nilai Akhir: ");
  int nilai = in.nextInt();
 
  char hMutu = ' ';
 
  if ((nilai >= 80) && (nilai <= 100)) {
    hMutu = 'A';
  }
  else if ((nilai >= 60) && (nilai < 80)) {
    hMutu = 'B';
  }
  else if ((nilai >= 40) && (nilai < 60)) {
    hMutu = 'C';
  }
  else if ((nilai >= 20) && (nilai < 40)) {
    hMutu = 'D';
  }
  else if ((nilai >= 0) && (nilai < 20)) {
    hMutu = 'E';
  }
  else {
    System.out.println("Inputan Tidak Sesuai!");
    System.out.println("Silakan ulangi lagi");
  }
 
  if ((nilai >= 0) && (nilai <= 100)) {
    System.out.println("Huruf Mutu Untuk Nilai " + nilai + " adalah: " + hMutu);
  }  
 }
}

import java.util.Scanner;
 
public class NilaiAkhir {
 public static void main(String[] args) {
  Scanner in = new Scanner(System.in);
 
  System.out.print("Username: ");
  String uName = in.next();
 
  System.out.print("Password: ");
  String uPass = in.next();
 
  if ((uName.equals("irfan") && uPass.equals("nafri"))) {
   System.out.println("Password benar. Sukses!");
  }
  else {
   System.out.println("Password salah. Ulangi");
  }
 }
}

import java.util.*;
 
public class TimerTest {
    static int minute = 0;
    static int second = 0;
 
    public static void main(String[] args) {
        int delay = 0;
        int period = 1000;
 
        Timer timer = new Timer();
 
        timer.scheduleAtFixedRate(new TimerTask() {
            public void run() {
               if (second < 60){
                System.out.println(minute + ":" + second);
               }
               else if (second >= 60) {
                second = 0;
                minute++;
                System.out.println(minute + ":" + second);
               }
               second++;
            }
        }, delay, period);
    }
}

import java.util.*;
 
public class TimerTest {
    static int second = 0;
 
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
 
        int delay = 0;
        int period = 1000;
 
        System.out.print("Second: ");
        second = in.nextInt();
 
        final Timer timer = new Timer();
 
        timer.scheduleAtFixedRate(new TimerTask() {
            public void run() {
               if (second >= 0){
                System.out.println(second);
               }
               else {
                timer.cancel();
               }
               second--;
            }
 
        }, delay, period);
    }
}

import java.util.Scanner;
 
public class UjiScan {
  public static void main (String[] args) {
     Scanner in = new Scanner(System.in);
  }
}

import java.util.Scanner;
 
public class UjiScan {
        public static void main (String[] args) {
                //Deklarasi Scanner:
                Scanner in = new Scanner(System.in);
 
                //Untuk Menerima Kata:
                System.out.print("Kata: ");
                String kata = in.nextLine();            
                System.out.println("Hello, " + kata);
 
                //Untuk Menerima Kalimat:
                System.out.print("Kalimat: ");
                String kalimat = in.nextLine();         
                System.out.println("Hello, " + kalimat);
 
                //Untuk Menerima Integer:
                System.out.print("Angka 1: ");
                int angka1 = in.nextInt();
                System.out.print("Angka 2: ");
                int angka2 = in.nextInt();              
                int hasil = angka1 + angka2;            
                System.out.println("Hasil Penjumlahan " + angka1 + " dan " + angka2 + " adalah: " + hasil);
 
                //Untuk Menerima Float:
                System.out.print("Angka 1: ");
                float angkafloat1 = in.nextFloat();
                System.out.print("Angka 2: ");
                float angkafloat2 = in.nextFloat();
                float hasilfloat = angkafloat1 + angkafloat2;           
                System.out.println("Hasil Penjumlahan " + angkafloat1 + " dan " + angkafloat2 + " adalah: " + hasilfloat);      
        }
}

/usr/local/jdk1.6.0

   export PATH=$PATH:/usr/local/jdk1.6.0/bin

   cd /home/irfan
   nano .bashrc

   PATH=$PATH:/usr/local/jdk1.6.0/bin

   jar cvf NamaJar.jar Nama1.class Nama2.class Nama3.class

   jar cvf NamaJar.jar .

   public class Nama1 {
     public static void main(String[] args) {
 
     }
   }

   Manifest-Version: 1.0
   Created-By: Irfan Ardiansah
   Main-Class: Nama1

   jar cvfm NamaJarEksekusi.jar manifest.txt Nama1.class Nama2.class Nama3.class

   jar cvfm NamaJarEksekusi.jar manifest.txt .

   java -jar NamaJarEksekusi.jar

   java -jar NamaFile.jar

   tipeData namaVariabel1;
 
   namaVariabel1 = isiAwal;
 
   tipeData namaVariabel2 = isiAwal;

public class Lokal {
 public static void main (String[] args) {
  int angka1 = 1;
  int angka2 = 3;
 }
}

public class Global {
 int angka1 = 1;
 int angka2 = 3;
 
 public static void main (String[] args) {
 
 }
}

public class Lokal {
 public static void main (String[] args) {
  int angka = 123456;
 
  float desimalKecil = 1;
  double desimalBesar = 1.887;
 
  char huruf = 'a';
 
  boolean kebenaran = true;
 
  System.out.println(angka);
  System.out.println(desimalKecil);
  System.out.println(desimalBesar);
  System.out.println(huruf);
  System.out.println(kebenaran);
 }
}