java - 使用 Scanner.nextLine() 从输入(键盘)读取

我正在使用 Java 实现顺序搜索。我正在尝试从字符串数组中搜索字符串。使用 nextLine() 从键盘获取查询。然而，即使字符串清楚地在列表中，我总是得到“未找到”。

/**
   Implementing sequential search
*/
public class SequentialSearch {
    public static boolean sequentialSearch(String[] names, String query) { //static method takes a string array and the query as arguments
        for (String x: names) //traverse the list
            if (x == query) {
                System.out.println("found");
                return true;
            } //end if
        System.out.println("not found"); //end for
        return false;
    } //end method
} //end class

class TestSequentialSearch {
    public static void main (String[] args) {
        String[] names = {"John", "Amy", "Tom", "Jay", "Olivia", "Jack", "Peter", "Emma"}; //a new name list
        Scanner in = new Scanner(System.in);
        String x;
        System.out.println(Arrays.toString(names));
        System.out.println("name to be searched: ");
        while (in.hasNextLine()) {
            x = in.nextLine();
            SequentialSearch.sequentialSearch(names, x); //search input in the list
            System.out.println("name to be searched: ");
        } //end while
    } //end main
} //end test

最佳答案

使用equals()方法而不是 == 进行字符串比较。 as equals 检查字符串内容是否相等，而 == 检查对象是否相等。更改代码 if 条件:

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