diff --git "a/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\235\250\344\270\260\350\261\252/Jiao.java" "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\235\250\344\270\260\350\261\252/Jiao.java"
new file mode 100644
index 0000000000000000000000000000000000000000..53e8c7286be78c19b3ab1893063b6501fe0b9d07
--- /dev/null
+++ "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\235\250\344\270\260\350\261\252/Jiao.java"
@@ -0,0 +1,29 @@
+package dong;
+
+public class Jiao {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+int a=10;
+int b=20;
+
+int arr[]=new int[2];
+arr[0]=a;
+arr[1]=b;
+
+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;
+	}
+}
+}
+System.out.println("a="+arr[0]);
+System.out.println("b="+arr[1]);
+
+	}
+
+}
diff --git "a/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\235\250\344\270\260\350\261\252/Pai.java" "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\235\250\344\270\260\350\261\252/Pai.java"
new file mode 100644
index 0000000000000000000000000000000000000000..7611521664174d0d6f89da5793a29e950fe90fde
--- /dev/null
+++ "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\235\250\344\270\260\350\261\252/Pai.java"
@@ -0,0 +1,33 @@
+package dong;
+
+public class Pai {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+//定义一个方法，用来实现如下功能：
+//已知一个数组 {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 {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};
+	int start=0;
+	int end = arr.length-1;
+	for (;start < end;start++,end--) {
+		int temp = arr[start];
+		arr[start]=arr[end];
+		arr[end] = temp;
+	}
+	System.out.print("交换后:"+"[");
+	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("]");
+	}
+		}
+
+	
+
+
diff --git "a/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\235\250\344\270\260\350\261\252/Shuzu.java" "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\235\250\344\270\260\350\261\252/Shuzu.java"
new file mode 100644
index 0000000000000000000000000000000000000000..3fa548966f35f05c49b7cf7576adb30ac33bf912
--- /dev/null
+++ "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\235\250\344\270\260\350\261\252/Shuzu.java"
@@ -0,0 +1,70 @@
+package dong;
+
+import java.util.Scanner;
+
+public class Shuzu {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+int arr[]= {90,80,70,50,30};
+int Newarr[]=new int[arr.length+1];
+
+printArray(arr);
+
+Scanner sc = new Scanner(System.in);
+
+System.out.println("请输入一个数字");
+int num = sc.nextInt();
+
+int index=0;
+for (int i = 0; i < arr.length; i++) {
+	if(num>arr[i]) {
+		index = i;
+		break;
+	}
+}
+
+if(index!=0) {
+	for (int i = 0; i < Newarr.length; i++) {
+		if(i<index) {
+			Newarr[i]=arr[i];
+		}
+		if(i==index) {
+			Newarr[i]=num;
+		}
+		if(i>index) {
+			Newarr[i]=arr[i-1];
+		}
+	}	
+}else {
+	for (int i = 0; i < Newarr.length; i++) {
+		if(i==Newarr.length-1) {
+			Newarr[i]=num;
+		}else {
+			Newarr[i]=arr[i];
+		}
+			
+	}
+	}
+printArray(Newarr);
+
+}
+
+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("]");
+	
+}
+
+
+
+	}
+
+
diff --git "a/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\235\250\344\270\260\350\261\252/Yingh.java" "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\235\250\344\270\260\350\261\252/Yingh.java"
new file mode 100644
index 0000000000000000000000000000000000000000..07eb8a9b062681af89dd385d87e93ce3ef73b0d2
--- /dev/null
+++ "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\235\250\344\270\260\350\261\252/Yingh.java"
@@ -0,0 +1,37 @@
+package 东东;
+import java.util.Random;
+public class Yingh {
+
+	public static void main(String[] args) {
+//		 		定义一个方法，实现的功能是：随机生成银行卡后7位数，返回的数据格式如：0586 756
+//				Random
+//				数组
+//				字符串截取
+				int a[]=new int [7];
+				String e=dong(a);
+				System.out.println(e);
+				
+				
+			}
+			public static String dong(int[] a) {
+				Random sc=new Random();
+				String b=" ";
+				for (int i = 0; i < a.length; i++) {
+					a[i]=sc.nextInt(10);
+						
+					}
+				for (int i = 0; i < a.length; i++) {
+					if (i==4) {
+						System.out.print(" "+a[i]);
+					}else {
+						System.out.print(a[i]);
+					}
+					
+				}
+				return b;
+			}
+			
+		
+	}
+
+