diff --git "a/Java\347\254\254\344\270\200\344\272\214\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\237/Helloworld.java.txt" "b/Java\347\254\254\344\270\200\344\272\214\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2371/Helloworld.java.txt"
similarity index 100%
rename from "Java\347\254\254\344\270\200\344\272\214\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\237/Helloworld.java.txt"
rename to "Java\347\254\254\344\270\200\344\272\214\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2371/Helloworld.java.txt"
diff --git "a/Java\347\254\254\344\270\200\344\272\214\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\237/\345\255\246\347\224\237\344\277\241\346\201\257.java.txt" "b/Java\347\254\254\344\270\200\344\272\214\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2371/\345\255\246\347\224\237\344\277\241\346\201\257.java.txt"
similarity index 100%
rename from "Java\347\254\254\344\270\200\344\272\214\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\237/\345\255\246\347\224\237\344\277\241\346\201\257.java.txt"
rename to "Java\347\254\254\344\270\200\344\272\214\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2371/\345\255\246\347\224\237\344\277\241\346\201\257.java.txt"
diff --git "a/Java\347\254\254\344\270\200\344\272\214\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\237/\345\256\242\346\210\267\344\277\241\346\201\257.java.txt" "b/Java\347\254\254\344\270\200\344\272\214\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2371/\345\256\242\346\210\267\344\277\241\346\201\257.java.txt"
similarity index 100%
rename from "Java\347\254\254\344\270\200\344\272\214\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\237/\345\256\242\346\210\267\344\277\241\346\201\257.java.txt"
rename to "Java\347\254\254\344\270\200\344\272\214\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2371/\345\256\242\346\210\267\344\277\241\346\201\257.java.txt"
diff --git "a/Java\347\254\254\344\270\200\344\272\214\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\237/\350\213\261\351\233\204\350\247\222\350\211\262.java.txt" "b/Java\347\254\254\344\270\200\344\272\214\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2371/\350\213\261\351\233\204\350\247\222\350\211\262.java.txt"
similarity index 100%
rename from "Java\347\254\254\344\270\200\344\272\214\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\237/\350\213\261\351\233\204\350\247\222\350\211\262.java.txt"
rename to "Java\347\254\254\344\270\200\344\272\214\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2371/\350\213\261\351\233\204\350\247\222\350\211\262.java.txt"
diff --git "a/Java\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2372/\345\217\230\351\207\217\344\272\222\346\215\242.txt" "b/Java\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2372/\345\217\230\351\207\217\344\272\222\346\215\242.txt"
new file mode 100644
index 0000000000000000000000000000000000000000..98f27d7623e5648ad30f1cc096ab03ef78a6e157
--- /dev/null
+++ "b/Java\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2372/\345\217\230\351\207\217\344\272\222\346\215\242.txt"
@@ -0,0 +1,30 @@
+package bianliang;
+	
+import java.util.Scanner;
+
+public class BianLiang {
+	
+	public static void main (String[] args ) {
+		int nmb1 ;
+		int nmb2 ;
+		int nmb3 ;
+
+		Scanner scan = new Scanner(System.in);
+		System.out.println("请输入第一个数字")；
+		nub1 = scan.nextInt();
+		System.out.printIn{"请输入第二个数字"}；
+		nub2 = scan.nextlnt();
+		System.out.println{"输入的二个数字是："};
+		System.out.println{"nmb1 = " +nmb1};
+		System.out.println{"nmb1 = " + nmb2};
+
+		nmb3 = nmb1;
+		nmb1 = nmb2;
+		nmb2 = nmb3;
+		
+		System.out.println("互换的两个数字是：");
+		System.out.println("nmb1 = "+ nmb1);
+		System.out.println("nmb2 = "+ nmb2);	
+
+}
+}
\ No newline at end of file
diff --git "a/Java\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2372/\346\200\273\347\273\223.txt" "b/Java\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2372/\346\200\273\347\273\223.txt"
new file mode 100644
index 0000000000000000000000000000000000000000..6f3e45a76d1abd92e3c734780ab6c6c3f21ffa52
--- /dev/null
+++ "b/Java\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2372/\346\200\273\347\273\223.txt"
@@ -0,0 +1,26 @@
+import java.nio.charset.Charset;
+
+public class ȡֵΧ {
+
+	public static void main(String[] args) {
+	System.out.println(Byte.MAX_VALUE);
+	System.out.println(Short.MAX_VALUE);
+	System.out.println(Integer.MAX_VALUE);
+	System.out.println(Long.MAX_VALUE);
+	System.out.println(Float.MAX_VALUE);
+	System.out.println(Double.MAX_VALUE);
+	
+	System.out.println(Byte.MIN_VALUE);
+	System.out.println(Short.MIN_VALUE);
+	System.out.println(Integer.MIN_VALUE);
+	System.out.println(Long.MIN_VALUE);
+	System.out.println(Float.MIN_VALUE);
+	System.out.println(Double.MIN_VALUE);
+	
+	
+	
+	
+	
+	
+}
+}
\ No newline at end of file
diff --git "a/Java\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2372/\347\273\203\344\271\2403.txt" "b/Java\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2372/\347\273\203\344\271\2403.txt"
new file mode 100644
index 0000000000000000000000000000000000000000..8cfde5bcf56f74e820738b5a2279c662186f58aa
--- /dev/null
+++ "b/Java\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2372/\347\273\203\344\271\2403.txt"
@@ -0,0 +1,23 @@
+package bianliang;
+
+import java.util.Scanner;
+
+public class 练习三 {
+	
+	public static void main (String[] args){
+		int num1;
+		float num2;
+		double num3;
+		int sum;
+	
+	Scanner scan = new Scanner(System.in);
+	System.out.println("请输入第一个数字");
+		num1 =scan.nextInt();
+		System.out.println("请输入第二个数字");
+		num2 =scan.nextByte();
+		System.out.println("请输入第三个数字");
+		num3 =scan.nextDouble();
+		System.out.println("三数字相加为");
+		System.out.println(sum=(int) (num1+num2+num3));
+}
+}
\ No newline at end of file
diff --git "a/Java\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2372/\347\273\203\344\271\2404.txt" "b/Java\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2372/\347\273\203\344\271\2404.txt"
new file mode 100644
index 0000000000000000000000000000000000000000..bab60b2a9ee196223c97abea3a27de5bbabff2f1
--- /dev/null
+++ "b/Java\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2372/\347\273\203\344\271\2404.txt"
@@ -0,0 +1,26 @@
+package sda;
+
+import java.util.Scanner;
+
+public class ；联系四 {
+
+	public static void main(String[] args) {
+		int num1;
+		byte num2;
+		float num3;
+		double num4;
+		
+		Scanner scan = new Scanner(System.in);
+		
+		System.out.println("请输入一个数据");
+		num4 = scan.nextDouble();
+		num1 = (int)num4;
+		num2 = (byte)num4;
+		num3 = (float)num4;
+		
+		double sum = num1 + num2 + num3;
+		
+		System.out.println("强制转换后的总和为"+sum);
+		
+			
+	}}	
\ No newline at end of file
diff --git "a/Java\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2375/\345\244\247\345\260\217\345\210\244\346\226\255.java" "b/Java\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2375/\345\244\247\345\260\217\345\210\244\346\226\255.java"
new file mode 100644
index 0000000000000000000000000000000000000000..b81b6dc00448950f2f2d262c0188464226cd1c95
--- /dev/null
+++ "b/Java\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2375/\345\244\247\345\260\217\345\210\244\346\226\255.java"
@@ -0,0 +1,23 @@
+package cm.md.com;
+
+import java.util.Scanner;
+
+public class Demo {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		
+		int a;
+		int b;
+	Scanner scan = new Scanner(System.in);
+	System.out.println("��ֱ�����������");
+		a = scan.nextInt();
+		b = scan.nextInt();
+		
+		int c = a > b ? a : b;
+		
+		System.out.println(c);
+		
+	}
+
+}
diff --git "a/Java\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2375/\345\245\207\345\201\266\345\210\244\346\226\255.java" "b/Java\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2375/\345\245\207\345\201\266\345\210\244\346\226\255.java"
new file mode 100644
index 0000000000000000000000000000000000000000..68147f924c5ffa1ac55eb225a156777f4b4e898e
--- /dev/null
+++ "b/Java\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2375/\345\245\207\345\201\266\345\210\244\346\226\255.java"
@@ -0,0 +1,24 @@
+package cm.md.com;
+
+import java.util.Scanner;
+
+public class Demo {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		
+		int a;
+		String b;
+		
+		Scanner scan = new Scanner(System.in);
+		
+		System.out.println("������һ������");
+		a = scan.nextInt();
+		
+		 b = a % 2 == 0 ? a+"��ż��" : a+"������";
+		 
+		 System.out.println(b);
+		
+	}
+
+}
diff --git "a/Java\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2375/\346\230\257\345\220\246\346\230\257\351\227\260\345\271\264.java" "b/Java\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2375/\346\230\257\345\220\246\346\230\257\351\227\260\345\271\264.java"
new file mode 100644
index 0000000000000000000000000000000000000000..644e7addd954419b4ef4838647a162c9205a62f8
--- /dev/null
+++ "b/Java\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2375/\346\230\257\345\220\246\346\230\257\351\227\260\345\271\264.java"
@@ -0,0 +1,26 @@
+package cm.md.lession;
+
+import java.util.Scanner;
+
+public class Demo {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		Scanner scan = new Scanner(System.in);
+		
+		System.out.println("����һ�����");
+		
+		int ww = scan.nextInt();
+		if(ww > 999 | ww < 10000) {System.out.println("�����");}
+		else{System.out.println("�����������");}
+		
+		
+		if ( ww % 4==0 && ww % 100==0 && ww % 400 ==0) {
+			System.out.println(ww+"������");
+		} 
+		else {
+			System.out.println(ww+"��������");
+		}
+	}
+
+}
diff --git "a/Java\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2375/\346\234\200\351\253\230\345\222\214\345\260\232.java" "b/Java\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2375/\346\234\200\351\253\230\345\222\214\345\260\232.java"
new file mode 100644
index 0000000000000000000000000000000000000000..89d1435f6c8a080d921a75a3af01348e95714b76
--- /dev/null
+++ "b/Java\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2375/\346\234\200\351\253\230\345\222\214\345\260\232.java"
@@ -0,0 +1,20 @@
+package cm.md.com;
+
+import java.util.Scanner;
+
+public class Demo {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		
+		int a = 150 ;
+		int b = 210 ;
+		int c = 165 ;	
+		int d = a > b ? a : b;
+		int e = d > c ? d : c;
+		
+		System.out.println(e);
+		
+	}
+
+}
diff --git "a/Java\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2375/\346\263\250\345\206\214.java" "b/Java\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2375/\346\263\250\345\206\214.java"
new file mode 100644
index 0000000000000000000000000000000000000000..bb8ce803d0f9f3368ee63e5f785c06a42b190686
--- /dev/null
+++ "b/Java\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2375/\346\263\250\345\206\214.java"
@@ -0,0 +1,25 @@
+package cm.md.lession;
+
+import java.util.Scanner;
+
+public class Demo {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		Scanner scan = new Scanner(System.in);
+		System.out.println("ע��ҳ��");
+		System.out.println("�������û���");
+		String Y1 = scan.next();
+		System.out.println("����������");
+		int m = scan.nextInt();
+		System.out.println("���ٴ���������");
+		int m1 = scan.nextInt();
+		if (m == m1) {
+			System.out.println("��ϲ�㣬ע��ɹ�");
+		}
+		else {
+			System.out.println("�Բ�����������������벻һ�£�����������");
+		}
+	}
+
+}
diff --git "a/Java\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2373/\345\212\240\345\207\217\344\271\230\351\231\244.java" "b/Java\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2373/\345\212\240\345\207\217\344\271\230\351\231\244.java"
new file mode 100644
index 0000000000000000000000000000000000000000..1d9dc03c82bff2ad78643df41557dd7f86fafefa
--- /dev/null
+++ "b/Java\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2373/\345\212\240\345\207\217\344\271\230\351\231\244.java"
@@ -0,0 +1,30 @@
+package Lession;
+
+import java.util.Scanner;
+
+public class Deom {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		double num1;
+		double num2;
+		double sum;
+		
+		Scanner scan = new Scanner(System.in);
+		
+		System.out.println("�������һ����");
+		num1 = scan.nextDouble();
+		
+
+		System.out.println("������ڶ�����");
+		num2 = scan.nextDouble();
+		
+		System.out.println("num1 + mum2 = " + (num1 + num2));
+		System.out.println("num1 - mum2 = " + (num1 - num2));
+		System.out.println("num1 * mum2 = " + (num1 * num2));
+		System.out.println("num1 / mum2 = " + (num1 / num2));//((float)num1 / num2)
+		System.out.println("num1 % mum2 = " + (num1 % num2));
+	}
+		
+
+}
diff --git "a/Java\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2373/\345\233\233\344\275\215\346\225\260.java" "b/Java\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2373/\345\233\233\344\275\215\346\225\260.java"
new file mode 100644
index 0000000000000000000000000000000000000000..fb8b0a67c240d64070f75510193f0e12cda37378
--- /dev/null
+++ "b/Java\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2373/\345\233\233\344\275\215\346\225\260.java"
@@ -0,0 +1,24 @@
+package Lession;
+
+import java.util.Scanner;
+
+public class Deom {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		int num1;
+	
+		Scanner scan = new Scanner(System.in);
+		
+		System.out.println("������һ����λ����");
+		num1 = scan.nextInt();
+		
+		
+		System.out.println("��λ����ǧλ�� = " + (num1 / 1000));
+		System.out.println("��λ���İ�λ�� = " + (num1 % 1000/100 ));
+		System.out.println("��λ����ʮλ�� = " + (num1 % 100/10 ));
+		System.out.println("��λ���ĸ�λ�� = " + (num1 %10 ));
+	}
+		
+
+}
diff --git "a/Java\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2373/\345\234\206\351\235\242\347\247\257.java" "b/Java\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2373/\345\234\206\351\235\242\347\247\257.java"
new file mode 100644
index 0000000000000000000000000000000000000000..78f395bf6975abaa4beabafbbca60bea8f84ee18
--- /dev/null
+++ "b/Java\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2373/\345\234\206\351\235\242\347\247\257.java"
@@ -0,0 +1,20 @@
+package Lession;
+
+import java.util.Scanner;
+
+public class Deom {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		double r;
+		double num2;
+		
+		Scanner scan = new Scanner(System.in);
+		
+		System.out.println("����뾶ֵ");
+		r = scan.nextDouble();
+		double �� = 3.14;
+		System.out.println("Բ�����  = " +(�� * r * r));
+	}
+
+}
diff --git "a/Java\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2373/\346\221\204\346\260\217\350\275\254\346\215\242.java" "b/Java\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2373/\346\221\204\346\260\217\350\275\254\346\215\242.java"
new file mode 100644
index 0000000000000000000000000000000000000000..5a09bff01ab2139c203b7ee2c2f0e2964fdb78cd
--- /dev/null
+++ "b/Java\347\254\254\345\233\233\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\2373/\346\221\204\346\260\217\350\275\254\346\215\242.java"
@@ -0,0 +1,19 @@
+package Lession;
+
+import java.util.Scanner;
+
+public class Deom {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		double r;
+		double num2;
+		
+		Scanner scan = new Scanner(System.in);
+		
+		System.out.println("���뻪���¶�");
+		r = scan.nextDouble();
+		System.out.println(5/(double)9*(r-32));
+	}
+
+}