diff --git a/task01/src/com/example/task01/Point.java b/task01/src/com/example/task01/Point.java
index ec5c69e8..ee5a3cd5 100644
--- a/task01/src/com/example/task01/Point.java
+++ b/task01/src/com/example/task01/Point.java
@@ -4,8 +4,33 @@
  * Класс точки на плоскости
  */
 public class Point {
-    int x;
-    int y;
+    public int x;
+    public int y;
+
+    public Point() {
+        x = 0;
+        y = 0;
+    }
+
+    public Point(int x, int y) {
+        this.x = x;
+        this.y = y;
+    }
+
+    public void flip() {
+        int temp = x;
+        x = -y;
+        y = -temp;
+    }
+
+    double distance(Point point) {
+        return Math.sqrt((point.x - this.x) * (point.x - this.x) + (point.y - this.y) * (point.y - this.y));
+    }
+
+    @Override
+    public String toString() {
+        return String.format("(%d, %d)", x, y);
+    }
 
     void print() {
         String pointToString = String.format("(%d, %d)", x, y);
diff --git a/task01/src/com/example/task01/Task01Main.java b/task01/src/com/example/task01/Task01Main.java
index 7d71173a..58193004 100644
--- a/task01/src/com/example/task01/Task01Main.java
+++ b/task01/src/com/example/task01/Task01Main.java
@@ -2,12 +2,12 @@
 
 public class Task01Main {
     public static void main(String[] args) {
-        Point p1 = new Point();
-        p1.x = 10;
-        p1.y = 45;
-        Point p2 = new Point();
-        p2.x = 78;
-        p2.y = 12;
+        Point p1 = new Point(25, 8);
+
+        Point p2 = new Point(5, 7);
+
+        System.out.println(p1.distance(p2));
+
 
         System.out.println("Point 1:");
         p1.print();
diff --git a/task02/src/com/example/task02/Task02Main.java b/task02/src/com/example/task02/Task02Main.java
index 644a0eba..dbbbd506 100644
--- a/task02/src/com/example/task02/Task02Main.java
+++ b/task02/src/com/example/task02/Task02Main.java
@@ -2,6 +2,9 @@
 
 public class Task02Main {
     public static void main(String[] args) {
-
+        TimeSpan t1 = new TimeSpan(0, 50, 0);
+        TimeSpan t2 = new TimeSpan(0, 10, 0);
+        t1.add(t2);
+        System.out.println(t1.toString());
     }
 }
diff --git a/task02/src/com/example/task02/TimeSpan.java b/task02/src/com/example/task02/TimeSpan.java
new file mode 100644
index 00000000..4269c755
--- /dev/null
+++ b/task02/src/com/example/task02/TimeSpan.java
@@ -0,0 +1,48 @@
+package com.example.task02;
+
+public class TimeSpan {
+    private int hours = 0;
+    private int minutes = 0;
+    private int seconds = 0;
+
+    public int getHours() { return hours; }
+
+    public void setHours(int hours) { this.hours = hours; }
+
+    public int getMinutes() { return minutes; }
+
+    public void setMinutes(int minutes) { this.minutes = minutes; }
+
+    public int getSeconds() { return seconds; }
+
+    public void setSeconds(int seconds) { this.seconds = seconds; }
+
+    public TimeSpan(int hours, int minutes, int seconds) {
+        setNormalizedTime(hours, minutes, seconds);
+    }
+
+    private void setNormalizedTime(int hours, int minutes, int seconds) {
+        if (hours < 0 || minutes < 0 || seconds < 0)
+            throw new IllegalArgumentException("Время не может быть отрицательным!");
+
+        int totalSeconds = hours * 3600 + minutes * 60 + seconds;
+
+        this.hours = totalSeconds / 3600;
+        this.minutes = (totalSeconds % 3600) / 60;
+        this.seconds = totalSeconds % 60;
+    }
+    public void add(TimeSpan time) {
+        setNormalizedTime(hours + time.hours, minutes + time.minutes, seconds + time.seconds);
+    }
+
+    public void subtract(TimeSpan time) {
+        if ((time.hours * 3600 + time.minutes * 60 + time.seconds) > (hours * 3600 + minutes * 60 + seconds))
+            throw new IllegalArgumentException("Время не может быть отрицательным!");
+
+        setNormalizedTime(hours - time.hours, minutes - time.minutes, seconds - time.seconds);
+    }
+
+    public String toString() {
+        return String.format("%02d:%02d:%02d", hours, minutes, seconds);
+    }
+}
diff --git a/task03/src/com/example/task03/Complex.java b/task03/src/com/example/task03/Complex.java
new file mode 100644
index 00000000..5d75cfcc
--- /dev/null
+++ b/task03/src/com/example/task03/Complex.java
@@ -0,0 +1,38 @@
+package com.example.task03;
+
+public class Complex {
+    final private double real;
+    final private double imag;
+
+    public Complex(double real, double imag) {
+        this.real = real;
+        this.imag = imag;
+    };
+
+    public double getReal() {
+        return real;
+    };
+    public double getImag() {
+        return imag;
+    };
+
+    public Complex add(Complex other) {
+        return new Complex(this.real + other.real, this.imag + other.imag);
+    };
+
+    public Complex multiply(Complex other) {
+        double real = (this.real * other.real) - (this.imag * other.imag);
+        double imag = (this.real * other.imag) + (other.real * this.imag);
+
+        return new Complex(real, imag);
+    };
+
+    @Override
+    public String toString() {
+        String sign = "+";
+        if (imag < 0)
+            sign = "-";
+
+        return String.format("%.2f%s%.2fi", real, sign, Math.abs(imag));
+    };
+}
diff --git a/task03/src/com/example/task03/Task03Main.java b/task03/src/com/example/task03/Task03Main.java
index ae40e6f2..82b14d12 100644
--- a/task03/src/com/example/task03/Task03Main.java
+++ b/task03/src/com/example/task03/Task03Main.java
@@ -2,6 +2,8 @@
 
 public class Task03Main {
     public static void main(String[] args) {
-
+        Complex z1 = new Complex(1, 3);
+        Complex z2 = new Complex(4, -5);
+        System.out.println(z1.add(z2).toString());
     }
 }
diff --git a/task04/src/com/example/task04/Line.java b/task04/src/com/example/task04/Line.java
new file mode 100644
index 00000000..8c35b243
--- /dev/null
+++ b/task04/src/com/example/task04/Line.java
@@ -0,0 +1,30 @@
+package com.example.task04;
+
+
+public class Line {
+    private Point p1;
+    private Point p2;
+
+    public Point getP1() { return p1; }
+    public Point getP2() { return p2; }
+
+    public Line(Point p1, Point p2){
+        this.p1 = p1;
+        this.p2 = p2;
+    }
+
+    public double length() {
+        return p1.distance(p2);
+    }
+
+    private double distance(Point p) {
+        return Math.abs((p2.getY() - p1.getY()) * p.getX() - (p2.getX() - p1.getX()) * p.getY() + p2.getX() * p1.getY() - p2.getY() * p1.getX()) / this.length();
+    }
+
+    public boolean isCollinearLine(Point p) { return distance(p) == 0; }
+
+    @Override
+    public String toString() {
+        return String.format("(%d, %d)-(%d, %d)", p1.getX(), p1.getY(), p2.getX(), p2.getY());
+    }
+}
diff --git a/task04/src/com/example/task04/Point.java b/task04/src/com/example/task04/Point.java
new file mode 100644
index 00000000..6dfa75f8
--- /dev/null
+++ b/task04/src/com/example/task04/Point.java
@@ -0,0 +1,29 @@
+package com.example.task04;
+
+public class Point {
+    final private int x;
+    final private int y;
+
+    public Point() {
+        x = 0;
+        y = 0;
+    }
+
+    public Point(int x, int y) {
+        this.x = x;
+        this.y = y;
+    }
+
+    public int getX() { return x; }
+    public int getY() { return y; }
+
+    public double distance(Point point) {
+        return Math.sqrt((point.x - this.x) * (point.x - this.x) + (point.y - this.y) * (point.y - this.y));
+    }
+
+    @Override
+    public String toString() {
+        return String.format("(%d, %d)", x, y);
+    }
+
+}
\ No newline at end of file
diff --git a/task04/src/com/example/task04/Task04Main.java b/task04/src/com/example/task04/Task04Main.java
index 55917a30..168c46a3 100644
--- a/task04/src/com/example/task04/Task04Main.java
+++ b/task04/src/com/example/task04/Task04Main.java
@@ -2,6 +2,14 @@
 
 public class Task04Main {
     public static void main(String[] args) {
+        Point p1 = new Point(1, 2);
+        Point p2 = new Point(3, 4);
+        Point p3 = new Point(2, 3);
 
+        Line line = new Line(p1, p2);
+
+        System.out.println(line.isCollinearLine(p3));
+
+        //System.out.println(line.length());
     }
 }
diff --git a/task05/src/com/example/task05/Point.java b/task05/src/com/example/task05/Point.java
index 968ea652..6508651a 100644
--- a/task05/src/com/example/task05/Point.java
+++ b/task05/src/com/example/task05/Point.java
@@ -5,6 +5,9 @@
  */
 public class Point {
 
+    final private double x;
+    final private double y;
+
     /**
      * Конструктор, инициализирующий координаты точки
      *
@@ -12,7 +15,8 @@ public class Point {
      * @param y координата по оси ординат
      */
     public Point(double x, double y) {
-        throw new AssertionError();
+        this.x = x;
+        this.y = y;
     }
 
     /**
@@ -20,20 +24,14 @@ public Point(double x, double y) {
      *
      * @return координату точки по оси X
      */
-    public double getX() {
-        // TODO: реализовать
-        throw new AssertionError();
-    }
+    public double getX() { return x; }
 
     /**
      * Возвращает координату точки по оси ординат
      *
      * @return координату точки по оси Y
      */
-    public double getY() {
-        // TODO: реализовать
-        throw new AssertionError();
-    }
+    public double getY() { return y; }
 
     /**
      * Подсчитывает расстояние от текущей точки до точки, переданной в качестве параметра
@@ -42,8 +40,11 @@ public double getY() {
      * @return расстояние от текущей точки до переданной
      */
     public double getLength(Point point) {
-        // TODO: реализовать
-        throw new AssertionError();
+        return Math.sqrt((point.x - this.x) * (point.x - this.x) + (point.y - this.y) * (point.y - this.y));
     }
 
+    @Override
+    public String toString() {
+        return String.format("(%.2f, %.2f)", x ,y);
+    }
 }
diff --git a/task05/src/com/example/task05/PolygonalLine.java b/task05/src/com/example/task05/PolygonalLine.java
index b534bfd5..d9730b28 100644
--- a/task05/src/com/example/task05/PolygonalLine.java
+++ b/task05/src/com/example/task05/PolygonalLine.java
@@ -5,13 +5,25 @@
  */
 public class PolygonalLine {
 
+    private Point[] points;
+
     /**
      * Устанавливает точки ломаной линии
      *
      * @param points массив точек, которыми нужно проинициализировать ломаную линию
      */
     public void setPoints(Point[] points) {
-        // TODO: реализовать
+        if (points == null) { throw new NullPointerException("Массив точек не должен быть null"); }
+        if (points.length == 0) { throw new IllegalArgumentException("Массив точек не должен быть пустым!"); }
+
+        Point[] values = new Point[points.length];
+        for (int i = 0; i < points.length; i++) {
+            double x = points[i].getX();
+            double y = points[i].getY();
+            values[i] = new Point(x, y);
+        }
+
+        this.points = values;
     }
 
     /**
@@ -20,7 +32,19 @@ public void setPoints(Point[] points) {
      * @param point точка, которую нужно добавить к ломаной
      */
     public void addPoint(Point point) {
-        // TODO: реализовать
+        if (points == null) {
+            points = new Point[] {point};
+            return;
+        }
+
+        Point[] pointsWithAddedPoint = new Point[points.length + 1];
+        for (int i = 0; i < points.length; i++) {
+            double x = points[i].getX();
+            double y = points[i].getY();
+            pointsWithAddedPoint[i] = new Point(x, y);
+        }
+        pointsWithAddedPoint[pointsWithAddedPoint.length - 1] = new Point(point.getX(), point.getY());
+        points = pointsWithAddedPoint;
     }
 
     /**
@@ -30,7 +54,7 @@ public void addPoint(Point point) {
      * @param y координата по оси ординат
      */
     public void addPoint(double x, double y) {
-        // TODO: реализовать
+         addPoint(new Point(x, y));
     }
 
     /**
@@ -39,8 +63,12 @@ public void addPoint(double x, double y) {
      * @return длину ломаной линии
      */
     public double getLength() {
-        // TODO: реализовать
-        throw new AssertionError();
-    }
+        double length = 0.0;
+
+        for (int i = 1; i < points.length; i++) {
+            length += points[i].getLength(points[i-1]);
+        }
 
+        return length;
+    }
 }
diff --git a/task05/src/com/example/task05/Task05Main.java b/task05/src/com/example/task05/Task05Main.java
index 4f745fb6..17981648 100644
--- a/task05/src/com/example/task05/Task05Main.java
+++ b/task05/src/com/example/task05/Task05Main.java
@@ -2,6 +2,17 @@
 
 public class Task05Main {
     public static void main(String[] args) {
-
+        Point[] points = {
+                new Point(1, 2),
+                new Point(4, 6),
+                new Point(8, 9),
+                new Point(12, 12),
+                new Point(15, 16),
+        };
+        PolygonalLine line = new PolygonalLine();
+        for (Point p : points) {
+            line.addPoint(p);
+        }
+        System.out.println(line.getLength());
     }
 }