diff --git "a/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\226\275\346\261\237\345\263\260/Demo001.java" "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\226\275\346\261\237\345\263\260/Demo001.java"
new file mode 100644
index 0000000000000000000000000000000000000000..d08012a240e3deb6a67fc6ba60a6a6f87c9c3d39
--- /dev/null
+++ "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\226\275\346\261\237\345\263\260/Demo001.java"
@@ -0,0 +1,23 @@
+public class Demo2 {
+
+	public static void main(String[] args) {
+		
+		int [] arr2= {9,8,7,6,4,3,2,1,5};
+		
+		for(int i=0;i<arr2.length;i++) {
+			for(int x=0;x<	arr2.length-1-i;x++) {
+				if(arr2[x]<arr2[x+1]) {
+					int index;
+					index=arr2[x];
+					arr2[x]=arr2[x+1];
+					arr2[x+1]=index;
+				}
+			}
+		}
+		for(int y=0;y<arr2.length;y++) {
+			System.out.print(arr2[y]);
+			System.out.print("|");
+}
+	}
+
+}
\ No newline at end of file
diff --git "a/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\226\275\346\261\237\345\263\260/Demo002.java" "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\226\275\346\261\237\345\263\260/Demo002.java"
new file mode 100644
index 0000000000000000000000000000000000000000..cdedcc9b3bdad2d7e020da32fd78e02dd9f81626
--- /dev/null
+++ "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\226\275\346\261\237\345\263\260/Demo002.java"
@@ -0,0 +1,15 @@
+public class Demo3 {
+
+	public static void main(String[] args) {
+		int a=20;
+		int b=10;
+		
+		int index;
+		
+		index=a;//index=20,a=20,b=10
+		a=b;//index=20,a=10,b=10	
+		b=index;//index =20,b=20,a=10
+		System.out.println(a+","+b);
+	}
+
+}
\ No newline at end of file
diff --git "a/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\226\275\346\261\237\345\263\260/Demo003.java" "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\226\275\346\261\237\345\263\260/Demo003.java"
new file mode 100644
index 0000000000000000000000000000000000000000..b97e32f4d12ca6d0bbd905835b0c89a3d7784b2e
--- /dev/null
+++ "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\226\275\346\261\237\345\263\260/Demo003.java"
@@ -0,0 +1,22 @@
+public class Demo4 {
+
+	public static void main(String[] args) {
+		int [] a= {1,2,3,4,5,6,7,8,9};
+		
+		for(int i=0;i<a.length;i++) {
+			for(int j=0;j<a.length-1-i;j++) {
+				if(a[j+1]>a[j]) {
+					int index;
+					index=a[j];
+					a[j]=a[j+1];
+					a[j+1]=index;
+				}
+			}
+		}
+		for(int i=0;i<a.length;i++) {
+			System.out.print(a[i]);
+			System.out.print("|");
+		}
+	}
+
+}
diff --git "a/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\226\275\346\261\237\345\263\260/Demo004.java" "b/\346\226\271\346\263\225\345\244\215\344\271\2402/\346\226\275\346\261\237\345\263\260/Demo004.java"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391