diff --git "a/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\274\240\351\221\253/Deom01.java" "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\274\240\351\221\253/Deom01.java"
new file mode 100644
index 0000000000000000000000000000000000000000..c51d14f6d795dd42cf33f8a24dcebbf2cf481a6d
--- /dev/null
+++ "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\274\240\351\221\253/Deom01.java"
@@ -0,0 +1,48 @@
+package lesson;
+
+import java.util.Scanner;
+
+public class Deom01 {
+
+	public static void main(String[] args) {
+		Scanner scan = new Scanner(System.in);
+		System.out.println("请选择要计算的方法");
+		String a =scan.next();
+		System.out.println("请输入第一个数");
+		int c =scan.nextInt();
+		System.out.println("请输入第二个数");
+		int b =scan.nextInt();
+		switch (a) {
+		case "+":
+			System.out.println("返回的和是："+jia(c,b));
+			break;
+		case "-":
+			System.out.println("返回的差是："+jian(c,b));
+			break;
+		case "*":
+			System.out.println("返回的积是："+cheng(c,b));
+			break;
+		case "/":
+			System.out.println("返回的商是："+chu(c,b));
+			break;
+		default:
+			System.out.println("功能不足，没有这运算方法。");
+			break;
+		}
+	}
+
+	public static int jia(int c,int b) {
+		return c+b;
+		}
+	public static int jian(int c,int b) {
+		return c-b;
+		}
+	public static int cheng(int c,int b) {
+		return c*b;
+		}
+	public static int chu(int c,int b) {
+		return c/b;
+		}
+	}
+
+
diff --git "a/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\274\240\351\221\253/Deom02.java" "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\274\240\351\221\253/Deom02.java"
new file mode 100644
index 0000000000000000000000000000000000000000..4fba00d8b0e49a652fd4bc881cf664c209b5344c
--- /dev/null
+++ "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\274\240\351\221\253/Deom02.java"
@@ -0,0 +1,21 @@
+package lesson;
+
+public class Deom02 {
+
+	public static void main(String[] args) {
+		int [] nummax = {1,2,3,4,5};
+		
+		int result = bigger(nummax);
+		
+	}
+	public static int bigger(int[] nummax) {
+		int max =nummax[0];
+		for (int i = 1; i < nummax.length; i++) {
+			if(nummax[i]>max) {
+				max = nummax[i];
+			}
+		}
+		return max;
+	}
+	
+}
diff --git "a/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\274\240\351\221\253/Deom03.java" "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\274\240\351\221\253/Deom03.java"
new file mode 100644
index 0000000000000000000000000000000000000000..d36f9f88e6d7e00e8171d1d1aa8b008b9df0ec0b
--- /dev/null
+++ "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\274\240\351\221\253/Deom03.java"
@@ -0,0 +1,61 @@
+package lesson;
+
+import java.util.Scanner;
+
+public class Deom03 {
+
+	public static void main(String[] args) {
+		Scanner scan = new Scanner(System.in);
+		System.out.println("请选择要计算的图像的面积");
+		int a =scan.nextInt();
+		System.out.println("1.长方形的面积");
+		System.out.println("2.正方形的面积");
+		System.out.println("3.三角形的面积");
+		System.out.println("4.圆形的面积");
+		switch (a) {
+		case 1:	
+			System.out.println("请输入长");
+			int c =scan.nextInt();
+			System.out.println("请输入宽");
+			int b =scan.nextInt();
+			System.out.println("返回的长方形面积是："+cfx(c,b));
+			break;
+		case 2:
+			System.out.println("请输入边长");
+			int d =scan.nextInt();
+			System.out.println("返回的正方形面积是："+zfx(d));
+			break;
+		case 3:
+			System.out.println("请输入底");
+			int e =scan.nextInt();
+			System.out.println("请输入高");
+			int f =scan.nextInt();
+			System.out.println("返回的三角形面积是："+sjx(e,f));
+			break;
+		case 4:
+			System.out.println("请输入半径");
+			double g =scan.nextDouble();
+			System.out.println("返回的圆形面积是："+yx(g));
+			break;
+		default:
+			System.out.println("功能不足，没有。");
+			break;
+		}
+	}
+
+	public static int cfx(int c,int b) {
+		return c*b;
+		}
+	public static int zfx(int d) {
+		return d*d;
+		}
+	public static int sjx(int e,int f) {
+		return e*f/2;
+		}
+	public static double yx(double g) {
+		return g*g*3.14;
+		}
+
+
+	}
+