Program Jaringan Syaraf Tiruan ( Algoritma Perceptron) 

File Perceptron.java

public class Perceptron {
    private int[][] x;
    private int[] w;
    private int[] t;
    private int b;
    private int lRate;
    private int y;
    private int epoch;
    private int net;
    private boolean stop;


    private boolean[] bobotBerubah;

    public Perceptron(){
        initial();
        printInput();
        learning();
    }

    private void printInput(){
        System.out.println("Bobot awal dan bias: "+w[0]+" "+w[1]+" "+b);
        System.out.println("Input data:  x1 x2 target");
        for(int i=0;i<4;i++){
            System.out.println("Data ke-"+i+": "+x[i][0]+" "+x[i][1]+"  "+t[i]);
        }
    }

    private void initial(){
        System.out.print("Initialing process....................\n");
        // initial input
        x = new int[4][2];
        x[0][0] = 1;
        x[0][1] = 1;
        x[1][0] = 1;
        x[1][1] = -1;
        x[2][0] = -1;;
        x[2][1] = 1;
        x[3][0] = -1;
        x[3][1] = -1;

        // initial bobot;
        w = new int[2];
        w[0] = 0;
        w[1] = 0;

        // initial bias
        b = 0;

        // initial target;
        t = new int[4];
        t[0] = 1;
        t[1] = -1;
        t[2] = -1;
        t[3] = -1;

        // initial hasil(y) dan learning rate (alfa)
        lRate = 1;
        y = 0;

        // initial bobot berubah
        bobotBerubah = new boolean[4];
        for(int i=0;i<4;i++){
            bobotBerubah[i] = false;
        }
    }

    private void learning(){
        System.out.print("Learning process...............\n");
        stop = false;
        epoch = 0;
        while(stop == false){
            epoch++;
            System.out.print("Epoch ke-"+epoch+"\n");
            for(int i=0;i<4;i++){
                net = x[i][0] * w[0] + x[i][1] * w[1] + b;
                y = f(net);
                if (y != t[i]) {
                    perbaikiBobot(i);
                    bobotBerubah[i] = true;
                }else{
                    bobotBerubah[i] = false;
                }
                System.out.print("data ke-"+i+" w1 w2 dan b: "+w[0]+" "+w[1]+" "+b+"\n");
            }           
            if(checkStop())stop = true;
        }
    }

    private boolean checkStop(){
        if(bobotBerubah[0])return false;
        if(bobotBerubah[1])return false;
        if(bobotBerubah[2])return false;
        if(bobotBerubah[3])return false;
        else return true;
    }

    private int f(int net){
        if(net > 0) return 1;
        else if(net == 0) return 0;
        else return -1;
    }

    private void perbaikiBobot(int i){
        w[0] = w[0] + lRate * t[i] * x[i][0];
        w[1] = w[1] + lRate * t[i] * x[i][1];
        b = b + lRate * t[i];
    }

    public void paternRecognize(int x1, int x2){
        System.out.println("Pengenalan pola");
        int net = x1 * w[0] + x2 * w[1] + b;
        System.out.println("Input [x1 x2]: ["+x1+" "+x2+"] gerbang 'AND' dikenal dengan nilai "+f(net));
    }
}

Main.java

public class Main {
    public static void main(String[] args) {
        Perceptron p = new Perceptron();
        p.paternRecognize(1, 1);
        p.paternRecognize(1, -1);
        p.paternRecognize(-1, 1);
        p.paternRecognize(-1, -1);
    }
}

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