diff --git a/task01/src/com/example/task01/Point.java b/task01/src/com/example/task01/Point.java
index ec5c69e8..44666728 100644
--- a/task01/src/com/example/task01/Point.java
+++ b/task01/src/com/example/task01/Point.java
@@ -7,8 +7,33 @@ public class Point {
     int x;
     int y;
 
+    public Point(int x, int y){
+        this.x = x;
+        this.y = y;
+    }
+
+    public  Point(){
+        this(0,0);
+    }
+
+    void flip(){
+        int item = x;
+        x = - y;
+        y = - item;
+    }
+
+    double distance(Point point){
+        double distanceX = point.x - this.x;
+        double distanceY = point.y - this.y;
+        double result = Math.sqrt((distanceX * distanceX) + (distanceY * distanceY));
+        return result;
+    }
+
+    public String toString(){
+        return String.format("(%d, %d)", x, y);
+    }
+
     void print() {
-        String pointToString = String.format("(%d, %d)", x, y);
-        System.out.println(pointToString);
+        System.out.println(toString());
     }
 }
diff --git a/task01/src/com/example/task01/Task01Main.java b/task01/src/com/example/task01/Task01Main.java
index 7d71173a..137e7cd3 100644
--- a/task01/src/com/example/task01/Task01Main.java
+++ b/task01/src/com/example/task01/Task01Main.java
@@ -2,18 +2,22 @@
 
 public class Task01Main {
     public static void main(String[] args) {
-        Point p1 = new Point();
-        p1.x = 10;
-        p1.y = 45;
+        Point p1 = new Point(10,45);
+        p1.x = 11;
+        p1.y = 46;
         Point p2 = new Point();
         p2.x = 78;
         p2.y = 12;
 
+        p1.flip();
+        System.out.println(p1);
+
+        System.out.println(p1.distance(p2));
+
+
         System.out.println("Point 1:");
-        p1.print();
         System.out.println(p1);
         System.out.println("Point 2:");
-        p2.print();
         System.out.println(p2);
     }
 }
diff --git a/task02/src/com/example/task02/Task02Main.java b/task02/src/com/example/task02/Task02Main.java
index 644a0eba..d6faccf0 100644
--- a/task02/src/com/example/task02/Task02Main.java
+++ b/task02/src/com/example/task02/Task02Main.java
@@ -2,6 +2,14 @@
 
 public class Task02Main {
     public static void main(String[] args) {
+        TimeSpan time1 = new TimeSpan(1,100,130);
+        System.out.println("Время 1 до ");
+        System.out.println(time1);
+        time1.setSeconds(3000);
+        System.out.println("Время 1 после");
+        System.out.println(time1);
+
+        time1.setSeconds(-1);
 
     }
 }
diff --git a/task02/src/com/example/task02/TimeSpan.java b/task02/src/com/example/task02/TimeSpan.java
new file mode 100644
index 00000000..058bd58b
--- /dev/null
+++ b/task02/src/com/example/task02/TimeSpan.java
@@ -0,0 +1,108 @@
+package com.example.task02;
+
+public class TimeSpan {
+
+    private int inHours;
+    private int inMinutes;
+    private int inSeconds;
+
+    public TimeSpan(int hours, int minutes, int seconds) {
+        if (hours < 0 || minutes < 0 || seconds < 0) {
+            throw new IllegalArgumentException("Все компоненты временного интервала должны быть неотрицательными");
+        }
+        this.inHours = hours;
+        this.inMinutes = minutes;
+        this.inSeconds = seconds;
+        transformTime(); // на случай, если минут/секунд ≥ 60
+    }
+
+    public int getHours() {
+        return inHours;
+    }
+
+    public void setHours(int hours) {
+        if (hours < 0) {
+            throw new IllegalArgumentException("Часы не могут быть отрицательными");
+        }
+        this.inHours = hours;
+        transformTime(); // на случай нормализации полей
+    }
+
+    public int getMinutes() {
+        return inMinutes;
+    }
+
+    public void setMinutes(int minutes) {
+        if (minutes < 0) {
+            throw new IllegalArgumentException("Минуты не могут быть отрицательными");
+        }
+        this.inMinutes = minutes;
+        transformTime();
+    }
+
+    public int getSeconds() {
+        return inSeconds;
+    }
+
+    public void setSeconds(int seconds) {
+        if (seconds < 0) {
+            throw new IllegalArgumentException("Секунды не могут быть отрицательными");
+        }
+        this.inSeconds = seconds;
+        transformTime();
+    }
+
+    private void transformTime() {
+        // Обработка секунд
+        if (inSeconds >= 60) {
+            inMinutes += inSeconds / 60;
+            inSeconds %= 60;
+        } else if (inSeconds < 0) {
+            int borrow = (-inSeconds + 59) / 60; // сколько минут занять
+            inMinutes -= borrow;
+            inSeconds += borrow * 60;
+        }
+
+        // Обработка минут
+        if (inMinutes >= 60) {
+            inHours += inMinutes / 60;
+            inMinutes %= 60;
+        } else if (inMinutes < 0) {
+            int borrow = (-inMinutes + 59) / 60; // сколько часов занять
+            inHours -= borrow;
+            inMinutes += borrow * 60;
+        }
+
+        if (inHours < 0) {
+            throw new IllegalStateException("Нельзя получить отрицательный временной интервал: результат вычитания недопустим");
+        }
+
+        // на случай переносов после заимствований
+        if (inMinutes >= 60) {
+            inHours += inMinutes / 60;
+            inMinutes %= 60;
+        }
+        if (inSeconds >= 60) {
+            inMinutes += inSeconds / 60;
+            inSeconds %= 60;
+        }
+    }
+
+    public void add(TimeSpan time) {
+        this.inHours += time.inHours;
+        this.inMinutes += time.inMinutes;
+        this.inSeconds += time.inSeconds;
+        transformTime();
+    }
+
+    public void subtract(TimeSpan time) {
+        this.inHours -= time.inHours;
+        this.inMinutes -= time.inMinutes;
+        this.inSeconds -= time.inSeconds;
+        transformTime();
+    }
+
+    public String toString() {
+        return String.format("Временной интервал: %d ч %d мин %d сек", inHours, inMinutes, inSeconds);
+    }
+}
diff --git a/task03/src/com/example/task03/ComplexNumbers.java b/task03/src/com/example/task03/ComplexNumbers.java
new file mode 100644
index 00000000..97497643
--- /dev/null
+++ b/task03/src/com/example/task03/ComplexNumbers.java
@@ -0,0 +1,38 @@
+package com.example.task03;
+
+public class ComplexNumbers {
+
+    private final double realPart;
+    private final double imaginaryPart;
+
+    public ComplexNumbers( double realPart, double imaginaryPart){
+        this.realPart = realPart;
+        this.imaginaryPart = imaginaryPart;
+    }
+
+    public ComplexNumbers add(ComplexNumbers comples){
+        return new ComplexNumbers(
+                this.realPart + comples.realPart,
+                this.imaginaryPart +  comples.imaginaryPart);
+    }
+
+    public ComplexNumbers product(ComplexNumbers complex){
+        double newReal = (this.realPart * complex.realPart) - (this.imaginaryPart * complex.imaginaryPart);
+        double newImaginary = this.realPart * complex.imaginaryPart + this.imaginaryPart * complex.realPart;
+        return new ComplexNumbers(newReal, newImaginary);
+    }
+
+    public String toString() {
+        if (realPart == 0 && imaginaryPart == 0) {
+            return "Комплексное число: 0";
+        } else if (realPart == 0) {
+            return String.format("Комплексное число: %.2fi", imaginaryPart);
+        } else if (imaginaryPart == 0) {
+            return String.format("Комплексное число: %.2f", realPart);
+        } else if (imaginaryPart > 0) {
+            return String.format("Комплексное число: %.2f + %.2fi", realPart, imaginaryPart);
+        } else {
+            return String.format("Комплексное число: %.2f - %.2fi", realPart, -imaginaryPart);
+        }
+    }
+}
diff --git a/task03/src/com/example/task03/Task03Main.java b/task03/src/com/example/task03/Task03Main.java
index ae40e6f2..fb49b20c 100644
--- a/task03/src/com/example/task03/Task03Main.java
+++ b/task03/src/com/example/task03/Task03Main.java
@@ -2,6 +2,13 @@
 
 public class Task03Main {
     public static void main(String[] args) {
+        ComplexNumbers complex1 = new ComplexNumbers(0,2);
+        ComplexNumbers complex2 = new ComplexNumbers(1,-4);
 
+        System.out.println(complex1);
+        System.out.println(complex2);
+
+        System.out.println(complex1.add(complex2));
+        System.out.println(complex1.product(complex2));
     }
 }
diff --git a/task04/src/com/example/task04/Line.java b/task04/src/com/example/task04/Line.java
new file mode 100644
index 00000000..9758333c
--- /dev/null
+++ b/task04/src/com/example/task04/Line.java
@@ -0,0 +1,55 @@
+package com.example.task04;
+
+import java.awt.*;
+
+class Point{
+    private final int x;
+    private final int y;
+
+    public Point(int x, int y){
+        this.x = x;
+        this.y = y;
+    }
+
+    public int getX() { return x; }
+    public int getY() { return y; }
+
+    public String toString() {
+        return "(" + x + ", " + y + ")";
+    }
+}
+
+public class Line {
+
+    private final Point p1;
+    private final Point p2;
+
+    public Line(Point p1, Point p2){
+        this.p1 = p1;
+        this.p2 = p2;
+    }
+
+
+
+    public Point getP1(){
+        return p1;
+    }
+
+    public Point getP2(){
+        return p2;
+    }
+
+    public String toString(){
+        return String.format("Отрезок с началом в (%d, %d) и с концом в (%d, %d)",
+                p1.getX(), p1.getY(), p2.getX(), p2.getY());
+    }
+
+    public boolean isCollinearLine(Point p){
+
+        int x = p.getX();
+        int y = p.getY();
+        int area = (x - p1.getX()) * (p2.getY() - p1.getY()) - (y - p1.getY()) * (p2.getX() - p1.getX());
+        return area == 0;
+    }
+
+}
diff --git a/task04/src/com/example/task04/Task04Main.java b/task04/src/com/example/task04/Task04Main.java
index 55917a30..a728c33e 100644
--- a/task04/src/com/example/task04/Task04Main.java
+++ b/task04/src/com/example/task04/Task04Main.java
@@ -3,5 +3,20 @@
 public class Task04Main {
     public static void main(String[] args) {
 
+        Point p1 = new Point(1,1);
+        Point p2 = new Point(4,5);
+        Line section = new Line(p1,p2);
+
+        Point startingPoint = section.getP1();
+        Point enddingPoint = section.getP2();
+
+        System.out.println("Начало отрезка - " + startingPoint);
+        System.out.println("Конец отрезка - " + enddingPoint);
+
+        System.out.println(section);
+
+        Point p3 = new Point(2,3);
+        System.out.println("Точка" + p3 + " на прямой: " + section.isCollinearLine(p3));
+
     }
 }
diff --git a/task05/src/com/example/task05/Point.java b/task05/src/com/example/task05/Point.java
index 968ea652..1cb4d94a 100644
--- a/task05/src/com/example/task05/Point.java
+++ b/task05/src/com/example/task05/Point.java
@@ -4,7 +4,8 @@
  * Точка в двумерном пространстве
  */
 public class Point {
-
+    private final double x;
+    private final double y;
     /**
      * Конструктор, инициализирующий координаты точки
      *
@@ -12,7 +13,8 @@ public class Point {
      * @param y координата по оси ординат
      */
     public Point(double x, double y) {
-        throw new AssertionError();
+        this.x = x;
+        this.y = y;
     }
 
     /**
@@ -22,7 +24,7 @@ public Point(double x, double y) {
      */
     public double getX() {
         // TODO: реализовать
-        throw new AssertionError();
+        return x;
     }
 
     /**
@@ -32,7 +34,7 @@ public double getX() {
      */
     public double getY() {
         // TODO: реализовать
-        throw new AssertionError();
+        return y;
     }
 
     /**
@@ -43,7 +45,8 @@ public double getY() {
      */
     public double getLength(Point point) {
         // TODO: реализовать
-        throw new AssertionError();
+        double deltaX = this.x - point.x;
+        double deltaY = this.y - point.y;
+        return Math.sqrt(deltaX * deltaX + deltaY * deltaY);
     }
-
 }
diff --git a/task05/src/com/example/task05/PolygonalLine.java b/task05/src/com/example/task05/PolygonalLine.java
index b534bfd5..d5077dee 100644
--- a/task05/src/com/example/task05/PolygonalLine.java
+++ b/task05/src/com/example/task05/PolygonalLine.java
@@ -1,10 +1,33 @@
 package com.example.task05;
 
+import sun.security.util.Length;
+import java.util.ArrayList;
+import java.util.List;
 /**
  * Ломаная линия
  */
 public class PolygonalLine {
 
+    private Point[] points;
+
+    public PolygonalLine() {
+        this.points = new Point[0];  // Создаем пустой массив точек
+    }
+
+    public PolygonalLine(Point[] points) {
+        if (points == null) {
+            this.points = new Point[0];
+        } else {
+            this.points = new Point[points.length];
+
+            for (int i = 0; i < points.length; i++){
+                if(points[i] != null){
+                    this.points[i] = new Point(points[i].getX(), points[i].getY());
+                }
+            }
+        }
+    }
+
     /**
      * Устанавливает точки ломаной линии
      *
@@ -12,6 +35,16 @@ public class PolygonalLine {
      */
     public void setPoints(Point[] points) {
         // TODO: реализовать
+        if (points == null) {
+            this.points = new Point[0];
+        } else {
+            this.points = new Point[points.length];
+            for (int i = 0; i < points.length; i++) {
+                if (points[i] != null) {
+                    this.points[i] = new Point(points[i].getX(), points[i].getY());
+                }
+                }
+        }
     }
 
     /**
@@ -21,6 +54,17 @@ public void setPoints(Point[] points) {
      */
     public void addPoint(Point point) {
         // TODO: реализовать
+        if (point == null) return;
+
+        Point newPoin = new Point(point.getX(), point.getY());
+
+        Point[] newPoint = new Point[points.length+1];
+
+        for (int i = 0; i < points.length; i++){
+            newPoint[i] = points[i];
+        }
+        newPoint[points.length] = newPoin;
+        points = newPoint;
     }
 
     /**
@@ -31,6 +75,8 @@ public void addPoint(Point point) {
      */
     public void addPoint(double x, double y) {
         // TODO: реализовать
+        Point point = new Point(x, y);
+        addPoint(point);
     }
 
     /**
@@ -40,7 +86,14 @@ public void addPoint(double x, double y) {
      */
     public double getLength() {
         // TODO: реализовать
-        throw new AssertionError();
+        if (points.length < 2) return 0.0;
+
+        double lineLength = 0.0;
+
+        for (int i = 0; i < points.length - 1; i++){
+            lineLength += points[i].getLength(points[i + 1]);
+        }
+        return lineLength;
     }
 
 }
diff --git a/task05/src/com/example/task05/Task05Main.java b/task05/src/com/example/task05/Task05Main.java
index 4f745fb6..ee2b4e8c 100644
--- a/task05/src/com/example/task05/Task05Main.java
+++ b/task05/src/com/example/task05/Task05Main.java
@@ -3,5 +3,15 @@
 public class Task05Main {
     public static void main(String[] args) {
 
+        PolygonalLine line = new PolygonalLine();
+        line.setPoints(new Point[]{
+                new Point(2,3),
+                new Point(4,4),
+                new Point(1,3),
+                new Point(7,2)
+        });
+        line.addPoint(0,5);
+        System.out.println("Длина ломаной: " + line.getLength());
+
     }
 }