Merge branch 'branch-Level9'

src/main/java/duke/Parser.java

@@ -40,6 +40,9 @@ public static Command parse(String input) throws DukeException {
             } else if (inputByParts[0].equals("done")) {
                 int taskNumber = Integer.parseInt(inputByParts[1]);
                 return new MarkDoneCommand(taskNumber);
+            } else if (inputByParts[0].equals("find")) {
+                String toFind = inputByParts[1];
+                return new FindCommand(toFind);
             } else {
                 String taskType = inputByParts[0];
                 validateTaskType(taskType);

src/main/java/duke/TaskList.java

@@ -3,6 +3,7 @@
 import duke.exception.DukeException;
 import duke.task.Task;
 
+import java.util.ArrayList;
 import java.util.List;
 
 public class TaskList {
@@ -50,6 +51,16 @@ public Task getTask(int taskNumber) throws DukeException {
         }
     }
 
+    public TaskList findTasks(String phrase) {
+        List<Task> searchResult = new ArrayList<>();
+        for (Task task: taskList) {
+            if (task.getDescription().contains(phrase)) {
+                searchResult.add(task);
+            }
+        }
+        return new TaskList(searchResult);
+    }
+
     public int getCount() {
         return taskList.size();
     }

src/main/java/duke/command/FindCommand.java

@@ -0,0 +1,24 @@
+package duke.command;
+
+import duke.Storage;
+import duke.TaskList;
+import duke.Ui;
+
+public class FindCommand implements Command {
+    private String toFind;
+
+    public FindCommand(String toFind) {
+        this.toFind = toFind;
+    }
+
+    @Override
+    public void execute(TaskList tasks, Ui ui, Storage storage) {
+        ui.listTasks(
+                tasks.findTasks(toFind));
+    }
+
+    @Override
+    public boolean isExit() {
+        return false;
+    }
+}

src/main/java/duke/task/Task.java

@@ -37,4 +37,8 @@ public String getSaveFormat() {
     protected String boxFormat(String symbol) {
         return String.format("[%s]", symbol);
     }
+
+    public String getDescription() {
+        return description;
+    }
 }