diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index df951b8..05baa1e 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -12,7 +12,7 @@ android {
         minSdk = 26
         targetSdk = 33
         versionCode = 1
-        versionName = "1.1"
+        versionName = "1.2"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }
diff --git a/app/src/main/java/com/uynaity/ezcc2/MainActivity.kt b/app/src/main/java/com/uynaity/ezcc2/MainActivity.kt
index d5d91f3..e8be08e 100644
--- a/app/src/main/java/com/uynaity/ezcc2/MainActivity.kt
+++ b/app/src/main/java/com/uynaity/ezcc2/MainActivity.kt
@@ -4,6 +4,7 @@ import android.annotation.SuppressLint
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
 import android.widget.Button
+import android.widget.Switch
 import android.widget.EditText
 import android.widget.TextView
 import android.widget.Toast
@@ -17,16 +18,40 @@ import android.widget.ImageButton
 import android.widget.Spinner
 
 
+@SuppressLint("UseSwitchCompatOrMaterialCode")
 class MainActivity : AppCompatActivity() {
     private lateinit var courseCodeEditText: EditText
     private lateinit var searchButton: Button
     private lateinit var clearButton: ImageButton
+    private lateinit var switch1: Switch
     private lateinit var sem1Stat: TextView
     private lateinit var sem1Data: TextView
     private lateinit var sem2Stat: TextView
     private lateinit var sem2Data: TextView
     private var backPressedTime: Long = 0
     private val backPressedInterval = 2000
+    private var isSorted = false
+
+    private var caches = mutableListOf(
+        "", ""
+    )
+
+    private var cachesSorted = mutableListOf(
+        "", ""
+    )
+
+    private var stats = mutableListOf(
+        "", ""
+    )
+
+    private var semList = mutableListOf(
+        mutableListOf<Map<String, Any>>(), mutableListOf()
+    )
+
+    private var sortedSemList = mutableListOf(
+        mutableListOf<Map<String, Any>>(), mutableListOf()
+    )
+
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -34,6 +59,7 @@ class MainActivity : AppCompatActivity() {
         courseCodeEditText = findViewById(R.id.courseCode)
         searchButton = findViewById(R.id.search)
         clearButton = findViewById(R.id.clearButton)
+        switch1 = findViewById(R.id.switch1)
         sem1Stat = findViewById(R.id.sem1Stat)
         sem1Data = findViewById(R.id.Sem1Data)
         sem2Stat = findViewById(R.id.Sem2Stat)
@@ -41,15 +67,24 @@ class MainActivity : AppCompatActivity() {
 
         val spinner = findViewById<Spinner>(R.id.spinner)
         val adapter = ArrayAdapter.createFromResource(
-            this, R.array.spinner_options, // 你的字符串数组资源
-            android.R.layout.simple_spinner_item
+            this, R.array.spinner_options, android.R.layout.simple_spinner_item
         )
         adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
         spinner.adapter = adapter
+
         searchButton.setOnClickListener {
             Thread {
                 try {
-                    getTableData(courseCodeEditText.text.toString())
+                    semList = getTableData(courseCodeEditText.text.toString())
+                    sortedSemList = semList.map { sem ->
+                        sem.sortedByDescending { it["空余数量"] as Int }.toMutableList()
+                    }.toMutableList()
+                    if (isSorted) {
+                        judgement()
+                    } else {
+                        judgement()
+                    }
+                    printSem()
                 } catch (e: Exception) {
                     sem1Stat.text = e.message
                 }
@@ -58,12 +93,20 @@ class MainActivity : AppCompatActivity() {
             val imm = getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
             imm.hideSoftInputFromWindow(searchButton.windowToken, 0)
         }
+
         clearButton.setOnClickListener {
             courseCodeEditText.text.clear()
             courseCodeEditText.requestFocus()
             val imm = getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
             imm.showSoftInput(courseCodeEditText, InputMethodManager.SHOW_IMPLICIT)
         }
+
+        switch1.setOnCheckedChangeListener { _, isChecked ->
+            isSorted = isChecked
+            if (semList[0].isNotEmpty() && semList[1].isNotEmpty()) {
+                printSem()
+            }
+        }
     }
 
     @Deprecated("Deprecated in Java")
@@ -139,37 +182,30 @@ class MainActivity : AppCompatActivity() {
                 semList[sem].add(dataSet)
             }
         }
-        judgement(semList)
         return semList
     }
 
 
     @SuppressLint("SetTextI18n")
-    private fun judgement(re: MutableList<MutableList<Map<String, Any>>>) {
-        val semList = mutableListOf(
-            sem1Data, sem2Data
-        )
-        val semStats = mutableListOf(
-            sem1Stat, sem2Stat
-        )
-        for (index in re.indices) {
-            val subList = re[index]
+    private fun judgement() {
+        for (index in semList.indices) {
+            val subList = semList[index]
             if (subList.isEmpty()) {
-                runOnUiThread {
-                    semStats[index].text = "未在Sem ${index + 1}中找到相关课程 :-("
-                }
+                stats[index] = "未在Sem ${index + 1}中找到相关课程 :-("
             } else {
-                runOnUiThread {
-                    semStats[index].text = "Sem ${index + 1}中找到以下相关课程:"
-                }
-            }
-            runOnUiThread {
-                semList[index].text = printSem(subList)
+                stats[index] = "Sem ${index + 1}中找到以下相关课程:"
             }
+            caches[index] = formatSem(subList)
+        }
+
+        for (index in sortedSemList.indices) {
+            val subList = sortedSemList[index]
+            cachesSorted[index] = formatSem(subList)
         }
+
     }
 
-    private fun printSem(sem: MutableList<Map<String, Any>>): String {
+    private fun formatSem(sem: MutableList<Map<String, Any>>): String {
         var str = ""
         for (i in sem) {
             for (j in i) {
@@ -179,4 +215,18 @@ class MainActivity : AppCompatActivity() {
         str += "\n"
         return str
     }
+
+    private fun printSem() {
+        runOnUiThread {
+            sem1Stat.text = stats[0]
+            sem2Stat.text = stats[1]
+            if (isSorted) {
+                sem1Data.text = cachesSorted[0]
+                sem2Data.text = cachesSorted[1]
+            } else {
+                sem1Data.text = caches[0]
+                sem2Data.text = caches[1]
+            }
+        }
+    }
 }
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index dec03ae..bc50a45 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -145,4 +145,15 @@
             app:srcCompat="@android:drawable/ic_menu_delete" />
     </LinearLayout>
 
+    <Switch
+        android:id="@+id/switch1"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:minHeight="48dp"
+        android:text="空余量↓"
+        app:layout_constraintBottom_toTopOf="@+id/linearLayout7"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toEndOf="@+id/search"
+        app:layout_constraintTop_toBottomOf="@+id/linearLayout6" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file