第三单元收尾，第四单元完成实验一

src/Unit_3/Test_2/Sort.java

@@ -1,10 +1,12 @@
 package Unit_3.Test_2;
 
+import java.util.List;
+
 public class Sort implements SortInterface {
     private int[] record;//定义待排序序列
 
     //构造函数，初始化序列
-    public Sort(int[] record) {
+    private Sort(int[] record) {
         this.record = record;
     }
     @Override
@@ -61,7 +63,6 @@ public void bubbleSort() {
     @Override
     public void quickSort(int first, int end) {
         if (first >= end) {
-            return;
         } else {
             int pivot = partition(first, end);
             quickSort(first, pivot - 1);
@@ -157,8 +158,17 @@ public void mergeSort2() {
 
     }
 
-    @Override
-    public void print() {
-
+@Override
+public void print() {
+    for (int e : record) {
+        System.out.print(e + " ");
     }
 }
+
+public static void main(String[] args) {
+    int[] list = {10,3,9,4,11,13,5,2};
+    Sort sort = new Sort(list);
+    sort.insertSort();
+    sort.print();
+}
+}

src/Unit_3/Test_3/DaffodilNumber.java

@@ -0,0 +1,43 @@
+package Unit_3.Test_3;
+
+public class DaffodilNumber {
+    private void DealNum(int i) {
+        int a = i % 10;
+        int b = i / 10 % 10;
+        int c = i / 100;
+        if (a * a * a + b * b * b + c * c * c == i) {
+            System.out.println(i);
+        }
+    }
+
+    public void ForDemo() {
+        for (int i = 100; i < 1000; i++) {
+            DealNum(i);
+        }
+    }
+
+    public void WhileDemo() {
+        int i = 100;
+        while (i < 1000) {
+            DealNum(i);
+            i++;
+        }
+    }
+
+    public void DoWhileDemo() {
+        int i = 100;
+        do {
+            DealNum(i);
+            i++;
+        } while (i < 1000);
+    }
+
+    public static void main(String[] args) {
+        DaffodilNumber daffodilNumber = new DaffodilNumber();
+        daffodilNumber.ForDemo();
+        System.out.println("----");
+        daffodilNumber.WhileDemo();
+        System.out.println("----");
+        daffodilNumber.DoWhileDemo();
+    }
+}

src/Unit_3/Test_3/DegreeChangeDemo.java

@@ -0,0 +1,12 @@
+package Unit_3.Test_3;
+
+public class DegreeChangeDemo {
+    public static void main(String[] args) {
+        int h, c;
+        System.out.println("摄氏温度\t华氏温度");
+        for (c = 0; c <= 40; c += 5) {
+            h = c * 9 / 5 + 32;
+            System.out.println("\t" + c + "\t" + h);
+        }
+    }
+}

src/Unit_3/Test_3/Factorial.java

@@ -0,0 +1,11 @@
+package Unit_3.Test_3;
+
+public class Factorial {
+    public static void main(String[] args) {
+        long result = 1;
+        for (int i = 2; i < 21; i++) {
+            result *= i;
+        }
+        System.out.println("20的阶乘为：" + result);
+    }
+}

src/Unit_3/Test_3/ForLoop.java

@@ -0,0 +1,13 @@
+package Unit_3.Test_3;
+
+public class ForLoop {
+    public static void main(String[] args) {
+        int limit = 100;
+        int sum = 0;
+        //下面这行代码利用for循环实现求和算法
+        for (int i = 1; i <= limit; i++) {
+            sum += i;
+        }
+        System.out.println("sum = " + sum);
+    }
+}

src/Unit_3/Test_3/NMumDemo.java

@@ -0,0 +1,23 @@
+package Unit_3.Test_3;
+
+public class NMumDemo {
+    public static void main(String[] args) {
+        int i, j, n = 9;
+        System.out.print(" * |");
+        for (i = 1; i <= n; i++) {
+            System.out.print("\t" + i);
+        }
+        System.out.print("\n---|");
+        for (i = 1; i <=n ; i++) {
+            System.out.print("----");
+        }
+        System.out.println();
+        for (i = 1; i <= n; i++) {
+            System.out.print(" " + i + " |");
+            for (j = 1; j <= i; j++) {
+                System.out.print("\t" + i * j);
+            }
+            System.out.println();
+        }
+    }
+}

src/Unit_3/Test_3/NumDemo.java

@@ -0,0 +1,14 @@
+package Unit_3.Test_3;
+
+public class NumDemo {
+    public static void main(String[] args) {
+        int n;
+        System.out.println("在1~1000可被3与5整除的为");
+        for (n = 0; n <= 1000; n++) {
+            if (n % 3 == 0 && n % 5 == 0) {
+                System.out.println(n);
+            }
+        }
+        System.out.println(" ");
+    }
+}

src/Unit_4/Test_1/ArrayDeclare.java

@@ -0,0 +1,14 @@
+package Unit_4.Test_1;
+
+public class ArrayDeclare {
+    public static void main(String[] args) {
+        int[] i = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+        for (int j = 0; j < i.length; j++) {
+            System.out.print(i[j] + " ");
+        }
+        System.out.println();
+        for (int j = i.length - 1; j > -1; j--) {
+            System.out.print(i[j] + " ");
+        }
+    }
+}

src/Unit_4/Test_1/ArrayRandom.java

@@ -0,0 +1,22 @@
+package Unit_4.Test_1;
+
+import java.util.Random;
+
+public class ArrayRandom {
+    public static void main(String[] args) {
+        Random rand = new Random();
+        int[] a = new int[rand.nextInt(20)];
+        double[] b = new double[rand.nextInt(20)];
+        System.out.println("a" + a.length);
+        System.out.println("b" + b.length);
+        for (int i = 0; i < a.length; i++) {
+            a[i] = rand.nextInt(20);
+            System.out.println("a[" + i + "]=" + a[i]);
+        }
+        for (int i = 0; i < b.length; i++) {
+            b[i] = rand.nextDouble();
+            b[i] = b[i] + a[i];
+            System.out.println("b[" + i + "]=" + b[i]);
+        }
+    }
+}

src/Unit_4/Test_1/ArraySort.java

@@ -0,0 +1,20 @@
+package Unit_4.Test_1;
+
+public class ArraySort {
+    public static void main(String[] args) {
+        int a[] = {20, 10, 50, 40, 30, 70, 60, 80, 90, 100};
+        int temp;
+        for (int i = 0; i < a.length - 1; i++) {
+            for (int j = i + 1; j < a.length; j++) {
+                if (a[i] < a[j]) {
+                    temp = a[i];
+                    a[i] = a[j];
+                    a[j] = temp;
+                }
+            }
+        }
+        for (int k = 0; k < a.length; k++) {
+            System.out.print(" " + a[k]);
+        }
+    }
+}

src/Unit_4/Test_1/Fibonacci.java

@@ -0,0 +1,14 @@
+package Unit_4.Test_1;
+
+public class Fibonacci {
+    public static void main(String[] args) {
+        int[] f = new int[10];
+        f[0] = f[1] = 1;
+        for (int i = 2; i < 10; i++) {
+            f[i] = f[i - 1] + f[i - 2];
+        }
+        for (int e : f) {
+            System.out.print(e + " ");
+        }
+    }
+}

src/Unit_4/Test_1/GetDay.java

@@ -0,0 +1,10 @@
+package Unit_4.Test_1;
+
+public class GetDay {
+    public static void main(String[] args) {
+        int day[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+        for (int i = 0; i < 12; i++) {
+            System.out.println((i + 1) + "月有" + day[i] + "天");
+        }
+    }
+}

src/Unit_4/Test_1/MaxAndMin.java

@@ -0,0 +1,17 @@
+package Unit_4.Test_1;
+
+public class MaxAndMin {
+    public static void main(String[] args) {
+        int[] a = {2, 4, 6, 3, 9, 1};
+        int min = a[0], max = a[0];
+        for (int i = 1; i < a.length; i++) {
+            if (a[i] < min) {
+                min = a[i];
+            }
+            if (a[i] > max) {
+                max = a[i];
+            }
+        }
+        System.out.println("最小值：" + min + "；" + "最大值：" + max);
+    }
+}

src/Unit_4/Test_1/Score.java

@@ -0,0 +1,10 @@
+package Unit_4.Test_1;
+
+public class Score {
+    public static void main(String[] args) {
+        int[] score = new int[]{12, 32, 45, 56, 67, 87, 98};
+        for (int i = 0; i < score.length; i++) {
+            System.out.println(score[i]);
+        }
+    }
+}