diff --git "a/\346\226\271\346\263\225\345\244\215\344\271\2402/\351\202\271\346\265\267\345\205\265/arrayJH2.java" "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\351\202\271\346\265\267\345\205\265/arrayJH2.java"
new file mode 100644
index 0000000000000000000000000000000000000000..cba0293b089c72e0bb684ba4b36d071322ec8034
--- /dev/null
+++ "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\351\202\271\346\265\267\345\205\265/arrayJH2.java"
@@ -0,0 +1,34 @@
+
+public class arrayJH2 {
+
+	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(arr);
+		System.out.println();
+		System.out.println("交换后");
+		printArray(newarr(arr));
+	}
+	public static int[] newarr(int[] arr) {
+		int end=arr.length-1;
+		for (int i = 0; i < end; i++,end--) {
+			int temp = arr[i];
+			arr[i]=arr[end];
+			arr[end]=temp;
+		}
+		return arr;
+	}
+	public static void printArray(int [] a) {
+		System.out.print("[");
+		for (int i = 0; i < a.length; i++) {
+			if (i==a.length-1) {
+				System.out.print(a[i]);
+			}else {
+				System.out.print(a[i]+",");
+			}
+		}
+		System.out.print("]");
+	}
+}
diff --git "a/\346\226\271\346\263\225\345\244\215\344\271\2402/\351\202\271\346\265\267\345\205\265/bank.java" "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\351\202\271\346\265\267\345\205\265/bank.java"
new file mode 100644
index 0000000000000000000000000000000000000000..62d059ded70744ba8dcd793aba5f08ca554938e7
--- /dev/null
+++ "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\351\202\271\346\265\267\345\205\265/bank.java"
@@ -0,0 +1,30 @@
+import java.util.Random;
+
+public class bank {
+
+	public static void main(String[] args) {
+//		����һ��������ʵ�ֵĹ����ǣ�����������п���7λ�������ص����ݸ�ʽ�磺0586 756
+//		Random
+//		����
+//		�ַ�����ȡ
+		bank();
+
+	}
+	public static void bank() {
+		Random ran= new Random();
+		int[] arr1=new int[4];
+		for (int i = 0; i < arr1.length; i++) {
+			arr1[i]=ran.nextInt(10);
+			String arrar1=Integer.toString(arr1[i]);
+			System.out.print(arrar1);
+		}
+		System.out.print(" ");
+		int[] arr2=new int[3];
+		for (int i = 0; i < arr2.length; i++) {
+			arr2[i]=ran.nextInt(10);
+			String array2=Integer.toString(arr2[i]);
+			System.out.print(array2);
+		}
+	}
+
+}
diff --git "a/\346\226\271\346\263\225\345\244\215\344\271\2402/\351\202\271\346\265\267\345\205\265/jiaohuan.java" "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\351\202\271\346\265\267\345\205\265/jiaohuan.java"
new file mode 100644
index 0000000000000000000000000000000000000000..c55699db08b184cc85667df1d52dc38ce3dd9a2f
--- /dev/null
+++ "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\351\202\271\346\265\267\345\205\265/jiaohuan.java"
@@ -0,0 +1,15 @@
+package af;
+
+public class jiaohuan {
+	//��֪������������a = 10��b = 20��ʹ�ó���ʵ�����������������ݽ���
+?        	//�������a = 20��b = 10;
+	public static void main(String[] args) {
+		int a=10;
+		int b=20;
+		int temp=a;
+		a=b;
+		b=temp;
+		System.out.println("a"+"="+a+"   "+"b"+"="+b);
+	}
+
+}
diff --git "a/\346\226\271\346\263\225\345\244\215\344\271\2402/\351\202\271\346\265\267\345\205\265/sad.java" "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\351\202\271\346\265\267\345\205\265/sad.java"
new file mode 100644
index 0000000000000000000000000000000000000000..118f9f2a69a9bf0a44119dc970f3d0397f540bb7
--- /dev/null
+++ "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\351\202\271\346\265\267\345\205\265/sad.java"
@@ -0,0 +1,37 @@
+package af;
+public class sad {
+
+	public static void main(String[] args) {
+		int[] a= {10,20,50,30,40,85};
+		printArray(a);
+		System.out.println();
+		printArray(arr(a));
+	}
+	public static int[] arr(int[]a){
+		int temp;
+		for (int k = 0; k < a.length; k++) {
+			for (int i = 0; i < a.length-1; i++) {
+					if(a[i]<a[i+1]) {
+						temp=a[i];
+						a[i]=a[i+1];
+						a[i+1]=temp;
+
+				}
+			}	
+		}
+	
+		return a;
+	}
+	
+	public static void printArray(int [] a) {
+		System.out.print("[");
+		for (int i = 0; i < a.length; i++) {
+			if (i==a.length-1) {
+				System.out.print(a[i]);
+			}else {
+				System.out.print(a[i]+",");
+			}
+		}
+		System.out.print("]");
+	}
+}
\ No newline at end of file