Done BTVN-old !!! (31/01/2024)

BT-Java/Buoi3/Bai1-Calculator/BTVN-Java-Buoi3-Lan1.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

BT-Java/Buoi3/Bai1-Calculator/src/service/CalculatorService.java

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+package service;
+
+public class CalculatorService {
+    private double a;
+    private double b;
+    public CalculatorService(){
+
+    }
+    public CalculatorService(double a, double b){
+        this.a = a;
+        this.b = b;
+    }
+
+    public double getA() {
+        return a;
+    }
+    public double getB(){
+        return b;
+    }
+    public void setA(double a) {
+        this.a = a;
+    }
+    public void setB(double b){
+        this.b = b;
+    }
+    public static double cong(double a, double b){
+        return a + b;
+    }
+    public static double tru(double a, double b){
+        return a - b;
+    }
+    public static double nhan(double a, double b){
+        return a * b;
+    }
+    public static double chia(double a, double b){
+        if(b == 0){
+            System.out.println("Loi: Phep toan khong chia duoc cho 0!!!");
+        }
+        return a/b;
+    }
+}

BT-Java/Buoi3/Bai1-Calculator/src/view/Calculator.java

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+package view;
+
+import service.CalculatorService;
+import java.util.Scanner;
+
+public class Calculator {
+    public static void main(String[] args){
+        Scanner scanner = new Scanner(System.in);
+        boolean check = true;
+        double so1, so2, ketqua;
+        while(check){
+            System.out.println("1. Phep cong");
+            System.out.println("2. Phep tru");
+            System.out.println("3. Phep nhan");
+            System.out.println("4. Phep chia");
+            System.out.println("0. Thoat!");
+            System.out.println("Chon so: ");
+            int choice = scanner.nextInt();
+            switch (choice){
+                case 1:
+                    System.out.println("Nhap a: ");
+                    so1 = scanner.nextDouble();
+                    System.out.println("Nhap b: ");
+                    so2 = scanner.nextDouble();
+                    ketqua = CalculatorService.cong(so1, so2);
+                    System.out.println("Ket qua: " + ketqua);
+                    break;
+                case 2:
+                    System.out.println("Nhap a: ");
+                    so1 = scanner.nextDouble();
+                    System.out.println("Nhap b: ");
+                    so2 = scanner.nextDouble();
+                    ketqua = CalculatorService.tru(so1, so2);
+                    System.out.println("Ket qua: " + ketqua);
+                    break;
+                case 3:
+                    System.out.println("Nhap a: ");
+                    so1 = scanner.nextDouble();
+                    System.out.println("Nhap b: ");
+                    so2 = scanner.nextDouble();
+                    ketqua = CalculatorService.nhan(so1, so2);
+                    System.out.println("Ket qua: " + ketqua);
+                    break;
+                case 4:
+                    System.out.println("Nhap a: ");
+                    so1 = scanner.nextDouble();
+                    System.out.println("Nhap b: ");
+                    so2 = scanner.nextDouble();
+                    ketqua = CalculatorService.chia(so1, so2);
+                    System.out.println("Ket qua: " + ketqua);
+                    break;
+                case 0:
+                    check = false;
+            }
+        }
+    }
+}

BT-Java/Buoi3/Bai2-PrimeChecker/BTVN-Java-Buoi3-Lan2.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

BT-Java/Buoi3/Bai2-PrimeChecker/src/service/PrimeCheckerService.java

@@ -0,0 +1,16 @@
+package service;
+public class PrimeCheckerService {
+    private int a;
+    public PrimeCheckerService(){}
+    public PrimeCheckerService(int a){
+        this.a = a;
+    }
+    public static boolean isPrime(int a){
+        for(int i = 2; i <= Math.sqrt(a); i++){
+            if(a%i == 0){
+                return false;
+            }
+        }
+        return a>1;
+    }
+}

BT-Java/Buoi3/Bai2-PrimeChecker/src/view/PrimeChecker.java

@@ -0,0 +1,18 @@
+package view;
+
+import java.util.Scanner;
+import service.PrimeCheckerService;
+public class PrimeChecker {
+    public static void main(String[] args){
+        Scanner scanner = new Scanner(System.in);
+        System.out.println("Nhap 1 so nguyen duong: ");
+        int a = scanner.nextInt();
+        if( a < 0 ){
+            System.out.println(a + " la so am");
+        } else if (PrimeCheckerService.isPrime(a)) {
+            System.out.println(a + " la so nguyen to");
+        } else{
+            System.out.println(a + " khong phai la so nguyen to");
+        }
+    }
+}

BT-Java/Buoi3/Bai3-SecondLargestNumber/BTVN-Java-Buoi3-Lan3.iml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

BT-Java/Buoi3/Bai3-SecondLargestNumber/src/Main.java

@@ -0,0 +1,34 @@
+import java.util.Scanner;
+
+public class Main {
+    public static int findSecondLargest(int[] numbers){
+        int firstLargest = numbers[0];
+        int secondLargest = Integer.MIN_VALUE;
+        for(int i = 1; i < numbers.length; i++){
+            if(numbers[i] > firstLargest){
+                firstLargest = numbers[i];
+            }
+        }
+        for(int i = 0; i < numbers.length; i++){
+            if(numbers[i] > secondLargest && numbers[i] < firstLargest){
+                secondLargest = numbers[i];
+            }
+        }
+        return secondLargest;
+    }
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        System.out.println("Nhap n: ");
+        int n = scanner.nextInt();
+        if(n<2){
+            System.out.println("Loi so luong phan tu: " + Integer.MIN_VALUE);
+        }else{
+            System.out.println("Nhap phan tu trong mang: ");
+            int[] numbers = new int[n];
+            for(int i = 0; i < numbers.length; i++){
+                numbers[i] = scanner.nextInt();
+            }
+            System.out.println("So lon thu hai la: " + findSecondLargest(numbers));
+        }
+    }
+}

BT-Java/Buoi3/Bai4-SumDuplicateElementCalculator/BTVN-Java-Buoi3-Lan4.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

BT-Java/Buoi3/Bai4-SumDuplicateElementCalculator/src/Main.java

@@ -0,0 +1,18 @@
+public class Main {
+    public static void calculateCommonElementsSum(int[] array1, int[] array2){
+        for(int i = 0; i < array1.length; i++){
+            for(int j = 0; j < array2.length; j++){
+                if(array1[i] == array2[j]){
+                    int ketqua = array1[i] + array2[j];
+                    System.out.println("Tong 2 so " + array1[i] + " la: " + ketqua);;
+                    break;
+                }
+            }
+        }
+    }
+    public static void main(String[] args) {
+        int[] array1 = {1, 2, 3, 4, 5};
+        int[] array2 = {3, 4, 5, 6, 7};
+        calculateCommonElementsSum(array1, array2);
+    }
+}