在 switch 語句中使用掃描儀，但我的程序只保留打印默認值

Question

我是一名正在學習編程的大學新生，顯然，我對此並不陌生，但我已經參與了 switch 語句。

我的程序的目標是像一本字典。 當用戶輸入術語時，程序應輸入其含義。 但我的程序一直打印default 。 你覺得我錯過了什么？ 這是我的代碼：

        Scanner scn = new Scanner(System.in);
            
        System.out.print("Enter the term:");
        String term = scn.nextLine();
            
        switch(term) {
            case "Programming":
                System.out.println("It is the process of creating a set of instructions to tell the computer how to do a task.");
            break;
            case "Java":
            System.out.println("A popular high-level and object-oriented programming language developed by Sun Microsystems in 1995 and now, owned by Oracle.");
            break;
            case "print":
                System.out.println("A method in Java that is used to display a text on the console.");
            break;
            case "scanner":
            System.out.println("It is used to get an input data from the user, and found in the java.util package.");
            break;
            case "packages":
                System.out.println("It organizes Java classes into namespaces, providing a unique namespace for each type it contains.");
            break;
            case "IDE":
                System.out.println("also known as Integrated Development Environment, a software app that enables us to write & debug programs more easily.");
            break;
            case "switch":
                System.out.println("Unlike conditionals, these statements only checks equality and only works strings, char, int and enums.");
            break;
            case "function":
                System.out.println("A block of organized, reusable code that is used to perform a single, related action.");
            break;
            case "Conditional Statements":
                System.out.println("It allows a program to take action based on the given condition.");
            break;
            case "IF-statements":
                System.out.println("It is one of the conditional statement that handles one conditional expression. It either does SOMETHING or NOTHING.");
            break;
            default: 
                System.out.println("Sorry, we don't have any information about that.");
                 }
                 
        scn.close();

對不起，如果這是一個冗長的程序，我想盡可能地把它做成十個項目。 我也忘了告訴你，我曾嘗試刪除Scanner並只聲明變量，程序工作（只是為了讓你知道我的程序也工作並打印字符串）。

無論如何，對於那些會回應的人，非常感謝您！

Answer 1

Posted 工作正常，至少對於輸入Java參見IDEone 。
很可能輸入不正確 - switch需要完全相同的文本：大小寫很重要，空格很重要，...

建議：在錯誤消息中包含輸入：

default: 
    System.out.println("Sorry, we don't have any information about '" 
                       + term + "'");

因此該消息可以幫助用戶（和開發人員）查看出了什么問題（甚至/特別是在生產代碼中）。

正如評論的那樣，對於這個用戶案例，最好忽略以下情況：

switch (term.toLowerCase()) {
    case "programming":   \\ the labels must all be lowercase too
        ...
    case "java":
        ...

Answer 2

如果輸入末尾有空格，則可以修剪該term.trim()