J. E. N. I.
Sekarang, penggunaan interface, kita gunakan kata kunci implements. Contohnya,
/** * Class ini mendefinisikan segmen garis */ public class Line implements Relation { private double x1; private double x2; private double y1; private double y2;
public Line( double x1, double x2, double y1, double y2){ this. x1 = x1; this. x2 = x2; this. y1 = y1; this. y2 = y2;
} public double getLength(){ double length = Math. sqrt(( x2-x1)*( x2-x1) +( y2-y1)*( y2-y1)); return length;
}
public boolean isGreater( Object a, Object b){ double aLen =(( Line) a). getLength(); double bLen =(( Line) b). getLength(); return( aLen > bLen);
}
public boolean isLess( Object a, Object b){ double aLen =(( Line) a). getLength(); double bLen =(( Line) b). getLength(); return( aLen < bLen);
}
} public boolean isEqual( Object a, Object b){ double aLen =(( Line) a). getLength(); double bLen =(( Line) b). getLength(); return( aLen == bLen);
}
Pengenalan Pemrograman 1 13