add questions

data/2.Java中阶/1.IO（输入输出）/2.输入输出流/Input.json

+{
+    "type": "code_options",
+    "author": "陈龙",
+    "source": "Input.md",
+    "exercise_id":"",
+    "notebook_enable": true
+}
\ No newline at end of file

data/2.Java中阶/1.IO（输入输出）/2.输入输出流/Input.md

+# Input
+
+
+以下 `Input` 程序中，不能正确从控制台输入的是：
+
+
+## 答案
+
+```java
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+public class Input {
+    public static void main(String[] args) {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        String input = null;
+        System.out.print("请开始输入：");
+        try {
+            input = br.read();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        System.out.println("请输入的字符串是：" + input);
+    }
+}
+```
+
+## 选项
+
+### A
+
+```java
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+public class Input {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        String input = null;
+        System.out.print("输入数据：");
+        try {
+            input = br.readLine();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        System.out.println("输入数据：" + input);
+    }
+}
+```
+
+### B
+
+```java
+
+import java.util.Scanner;
+
+public class Input {
+    public static void main(String[] args) {
+        System.out.print("请开始输入：");
+        Scanner scan = new Scanner(System.in);
+        String read = scan.nextLine();
+        System.out.println("请输入的字符串是："+read);
+    }
+}
+```
+
+### C
+
+```java
+public class Input {
+    public static void main(String[] args) {
+        char input = '\n';
+        System.out.println("请开始输入：");
+        StringBuilder sb = new StringBuilder();
+        do {
+            try {
+                input = (char) System.in.read();
+                sb.append(input);
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+        } while (input != '\n');
+        System.out.println("请输入的字符串是：" + sb);
+    }
+}
+```
+

data/2.Java中阶/1.IO（输入输出）/2.输入输出流/config.json

@@ -19,6 +19,6 @@
       }
     }
   ],
-  "export": [],
+  "export": ["Input.json"],
   "title": "输入输出流"
 }
\ No newline at end of file

data/2.Java中阶/1.IO（输入输出）/3.文件输入输出流/FileRead.json

+{
+    "type": "code_options",
+    "author": "陈龙",
+    "source": "FileRead.md",
+    "exercise_id":"",
+    "notebook_enable": true
+}
\ No newline at end of file

data/2.Java中阶/1.IO（输入输出）/3.文件输入输出流/FileRead.md

+# FileRead
+
+
+以下 `FileRead` 程序中，是按行读取文件的是：
+
+
+## 答案
+
+```java
+import java.io.*;
+
+public class FileRead {
+    public static void main(String[] args) throws IOException {
+        String filePath = "test.txt";
+        File file = new File(filePath);
+        BufferedReader reader = new BufferedReader(new FileReader(file));
+        String lineString = null;
+        while ((lineString = reader.readLine()) != null) {
+            System.out.println(lineString);
+        }
+        reader.close();
+    }
+}
+```
+
+## 选项
+
+### A
+
+```java
+import java.io.*;
+
+public class FileRead {
+    public static void main(String[] args) throws IOException {
+        String filePath = "test.txt";
+        InputStream in = null;
+        try {
+            byte[] bytes = new byte[20];
+            int length = 0;
+            in = new FileInputStream(filePath);
+            while ((length = in.read(bytes)) != -1) {
+                System.out.write(bytes, 0, length);
+            }
+        } catch (Exception e1) {
+            e1.printStackTrace();
+        } finally {
+            if (in != null) {
+                in.close();
+            }
+        }
+    }
+}
+```
+
+### B
+
+```java
+
+import java.io.*;
+
+public class FileRead {
+    public static void main(String[] args) throws IOException {
+        String filePath = "test.txt";
+        char[] chars = new char[20];
+        int length = 0;
+        Reader reader = new InputStreamReader(new FileInputStream(filePath));
+        while ((length = reader.read(chars)) != -1) {
+            for (int i = 0; i < length; i++) {
+                System.out.print(chars[i]);
+            }
+        }
+    }
+}
+```

data/2.Java中阶/1.IO（输入输出）/3.文件输入输出流/config.json

@@ -19,6 +19,6 @@
       }
     }
   ],
-  "export": [],
+  "export": ["FileRead.json"],
   "title": "文件输入输出流"
 }
\ No newline at end of file