exercise3

exercises/exercise2/first.java

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+import java.util.Scanner;
+public class first{
+    public static void main(String[] args) {
+        int test1;
+        int test2;
+        double radius;
+        System.out.println("Test Data:");
+        System.out.println("a. "+(-5 + 8 * 6));
+        System.out.println("b. "+ ((55+9) % 9));
+        System.out.println("c. "+ (20 + -3*5 / 8));
+        System.out.println("d. "+ (5 + 15 / 3 * 2 - 8 % 3));
+
+        Scanner scan = new Scanner(System.in);
+        System.out.println("Enter integer 1");
+        test1 = scan.nextInt();
+        
+        System.out.println("Enter integer 2");
+        test2 = scan.nextInt();
+
+        System.out.println("The PRODUCT of two integer: "+ (test1*test2));
+
+        System.out.println("Enter radius of a circle! (pi taken as 3!)");
+        radius = scan.nextDouble();
+        System.out.println("The area of circle: "+(3*radius*radius)+"\nThe perimeter of circle: "+(2*3*radius));
+    }
+}

exercises/exercise3/name.java

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+import java.util.Scanner;
+import java.util.Random;
+
+public class name{
+    public static void main(String args[]) {
+        String name1;
+        String name2;
+
+        Scanner scan = new Scanner(System.in);
+        Random generator = new Random();
+        int random1 = generator.nextInt(10,99);
+
+        System.out.println("Enter your name!");
+        name1 = scan.nextLine();
+        System.out.println("Enter your surname!");
+        name2 = scan.nextLine();
+
+        String selectedName1 = name1.substring(1);
+        String secretName1 = name1.replaceAll(selectedName1,"*");
+        String selectedName2 = name2.substring(5);
+        String secretName2 = name2.replaceAll(selectedName2,"*");
+        System.out.print("First name: "+secretName1+"\tLast Name: "+secretName2+"\tAccount ID: "+random1+"\n");
+
+        System.out.print("Phone number:");
+        int randomfirst = generator.nextInt(8);
+        int randomsecond = generator.nextInt(8);
+        int randomthird = generator.nextInt(8);
+        int random655 = generator.nextInt(556) + 100;
+        int random1000 = generator.nextInt(9000) + 1000;
+        System.out.println(""+randomfirst+randomsecond+randomthird+"-"+random655+"-"+random1000);
+
+        String original = "This is an original example string";
+        String change = original.replace("e", "j");
+        System.out.println("Original: "+original);
+        System.out.println("Change: "+change);
+    }
+}