diff --git a/实验1/task1.java b/实验1/task1.java
new file mode 100755
index 0000000..8ebfe23
--- /dev/null
+++ b/实验1/task1.java
@@ -0,0 +1,17 @@
+import java.util.Scanner;
+
+public class task1 {
+    public static void main(String args[]) {
+        Scanner input = new Scanner(System.in);
+        System.out.println("请输入第一个整数：");
+        int a = input.nextInt();
+        System.out.println("请输入第二个整数：");
+        int b = input.nextInt();
+        System.out.println("两数相加的结果为：" + (a + b));
+        System.out.println("两数相减的结果为：" + (a - b));
+        System.out.println("两数相乘的结果为：" + (a * b));
+        System.out.println("两数相除的结果为：" + (a / b));
+        System.out.println("两数取余数的结果为：" + (a % b));
+    }
+
+}
\ No newline at end of file
diff --git a/实验1/task2.java b/实验1/task2.java
new file mode 100755
index 0000000..4fa636f
--- /dev/null
+++ b/实验1/task2.java
@@ -0,0 +1,17 @@
+import java.util.Scanner;
+
+public class task2 {
+    public static void main(String[] args) {
+        Scanner input = new Scanner(System.in);
+        System.out.println("请输入一个数a：");
+        int a = input.nextInt();
+        System.out.println("请输入一个数b：");
+        int b = input.nextInt();
+        System.out.println("a==b=" + (a == b));
+        System.out.println("a!=b=" + (a != b));
+        System.out.println("a>b=" + (a > b));
+        System.out.println("a<b=" + (a < b));
+        System.out.println("b>=a=" + (b >= a));
+        System.out.println("b<=a=" + (b <= a));
+    }
+}
diff --git a/实验1/task3.java b/实验1/task3.java
new file mode 100755
index 0000000..35dc8f1
--- /dev/null
+++ b/实验1/task3.java
@@ -0,0 +1,9 @@
+import java.util.Scanner;
+
+public class task3 {
+    public static void main(String[] args) {
+        Scanner input = new Scanner(System.in);
+        int year = input.nextInt();
+        System.out.println(year + "年是否为闰年：" + ((year % 4 == 0) | (year % 400 == 0)));
+    }
+}
diff --git a/实验1/task4.java b/实验1/task4.java
new file mode 100755
index 0000000..2abafa8
--- /dev/null
+++ b/实验1/task4.java
@@ -0,0 +1,9 @@
+import java.util.Scanner;
+
+public class task4 {
+    public static void main(String[] args) {
+        Scanner input = new Scanner(System.in);
+        int num = input.nextInt();
+        System.out.println((num / 100 + num/10-num/100*10 + num % 10));
+    }
+}