From 123a51a555c8e7f22fdf94330ebc81becbc36efd Mon Sep 17 00:00:00 2001
From: zh363y468b3 <2463925854@qq.com>
Date: Mon, 19 Apr 2021 19:36:40 +0800
Subject: [PATCH] first commit

---
 .../\345\274\240\345\256\217/Demo1.txt"       | 22 +++++++++
 .../\345\274\240\345\256\217/Demo2.txt"       | 35 ++++++++++++++
 .../\345\274\240\345\256\217/Demo3.txt"       | 48 +++++++++++++++++++
 .../\345\274\240\345\256\217/Demo4.java"      | 27 +++++++++++
 4 files changed, 132 insertions(+)
 create mode 100644 "\346\226\271\346\263\225\345\244\215\344\271\2402/\345\274\240\345\256\217/Demo1.txt"
 create mode 100644 "\346\226\271\346\263\225\345\244\215\344\271\2402/\345\274\240\345\256\217/Demo2.txt"
 create mode 100644 "\346\226\271\346\263\225\345\244\215\344\271\2402/\345\274\240\345\256\217/Demo3.txt"
 create mode 100644 "\346\226\271\346\263\225\345\244\215\344\271\2402/\345\274\240\345\256\217/Demo4.java"

diff --git "a/\346\226\271\346\263\225\345\244\215\344\271\2402/\345\274\240\345\256\217/Demo1.txt" "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\345\274\240\345\256\217/Demo1.txt"
new file mode 100644
index 0000000..8006662
--- /dev/null
+++ "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\345\274\240\345\256\217/Demo1.txt"
@@ -0,0 +1,22 @@
+package md.lesson01.com;
+
+public class Demo1 {
+
+	public static void main(String[] args) {
+		//已知两个整数变量a = 10，b = 20，使用程序实现这两个变量的数据交换,得a=20,b=10
+		
+		int a = 10;
+		int b = 20;
+		System.out.println("a="+a);
+		System.out.println("b="+b);
+		System.out.println("数据转换后得:");
+		
+		int c = a;
+		a = b;
+		b = c;
+		System.out.println("a="+a);
+		System.out.println("b="+b);
+
+	}
+
+}
diff --git "a/\346\226\271\346\263\225\345\244\215\344\271\2402/\345\274\240\345\256\217/Demo2.txt" "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\345\274\240\345\256\217/Demo2.txt"
new file mode 100644
index 0000000..c3d65b3
--- /dev/null
+++ "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\345\274\240\345\256\217/Demo2.txt"
@@ -0,0 +1,35 @@
+package md.lesson01.com;
+
+public class Demo02 {
+
+	public static void main(String[] args) {
+		// 定义一个方法，用来实现如下功能：已知一个数组 arr = {19, 28, 37, 46, 50}; 用程序实现把数组中的元素值交换，交换后的数组 arr = {50, 46, 37, 28, 19}; 并在控制台输出交换后的数组元素
+			int [] arr = {19,28,37,46,50};
+			
+			printArray(Array(arr));
+			
+	}	
+			
+	public static int[] Array(int[] arr) {
+		int first = 0;
+		int edd = arr.length-1;
+		int c;
+			for (;first < edd;first++,edd--) {
+			c =arr[first];
+			arr[first] =arr[edd];
+			arr[edd] =c;
+		}
+			return arr;
+	}
+	public static void printArray(int[] arr) {
+		System.out.print("[");
+		for (int i = 0; i < arr.length; i++) {
+			if (i==arr.length-1) {
+				System.out.print(arr[i]);
+			}else {
+		System.out.print(arr[i] + ",");
+			}
+		}
+		System.out.print("]");
+	}
+  }
\ No newline at end of file
diff --git "a/\346\226\271\346\263\225\345\244\215\344\271\2402/\345\274\240\345\256\217/Demo3.txt" "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\345\274\240\345\256\217/Demo3.txt"
new file mode 100644
index 0000000..ac09cde
--- /dev/null
+++ "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\345\274\240\345\256\217/Demo3.txt"
@@ -0,0 +1,48 @@
+package md.lesson01.com;
+
+public class Demo03 {
+
+	public static void main(String[] args) {
+		// 定义一个函数，实现数组从大到小排序，传入一个乱序数组，返回一个从大到小排序的数组。
+			int [] arr = {35,59,12,95,70};
+			System.out.println("原数组:");
+			printArray(arr);
+			
+			System.out.println("降序得:");
+			printArray(sortArray(arr));
+	}
+
+
+	public static int[] sortArray(int[] arr) {
+		int num;
+		for (int i = 0; i < arr.length-1; i++) {
+			for (int j = 0; j < arr.length-1-i; j++) {
+				if (arr[j]<arr[j+1]) {
+					num = arr[j+1];
+					arr[j+1] = arr[j];
+					arr[j] = num;
+				}
+			}
+		}
+		return arr;
+	}
+	
+	public static void printArray(int[] arr) {
+		System.out.print("[");
+		for (int i = 0; i < arr.length; i++) {
+			if (i==arr.length-1) {
+				System.out.print(arr[i]);
+			}else {
+				System.out.print(arr[i] + ",");
+			}
+		}
+		System.out.println("]");
+	}
+}
+
+
+
+
+
+
+
diff --git "a/\346\226\271\346\263\225\345\244\215\344\271\2402/\345\274\240\345\256\217/Demo4.java" "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\345\274\240\345\256\217/Demo4.java"
new file mode 100644
index 0000000..fb54342
--- /dev/null
+++ "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\345\274\240\345\256\217/Demo4.java"
@@ -0,0 +1,27 @@
+package md.lesson01.com;
+
+import java.util.Random;
+
+import java.util.Scanner;
+
+public class Demo4 {
+
+	public static void main(String[] args) {
+		// ����������п���7λ�������ص����ݸ�ʽ�磺0586 756
+			Scanner scanner = new Scanner(System.in);
+			Random random = new Random();
+			int [] num1 = new int[4];
+			int [] num2 = new int[3];
+			System.out.println("���п�����λ��");
+			for (int i = 0; i < num1.length; i++) {
+				num1[i] = random.nextInt(10)+1;
+				System.out.print(num1[i]);
+			}
+			System.out.print(" ");
+			for (int i = 0; i < num2.length; i++) {
+				num2[i] = random.nextInt(10)+1;
+				System.out.print(num2[i]);
+			}
+	}
+
+}
-- 
Gitee