java - java如何从字符串中解析int？

Question

出于测试原因，我正在尝试从虚拟字符串中解析 int 。该字符串将是:

String numOfStudents = "Number of Students: 5";

我想解析这个字符串，确保它包含“Number of Students”行并找出 int 值。

我怎样才能实现这个目标？我需要 int 值将其与另一个 int 值进行比较。

谢谢

Answer 1

    final String NUM_OF_STUDENTS = "Number of Students: ";

    String numOfStudents = "Number of Students: 5";
    int lastIndex = numOfStudents.lastIndexOf(NUM_OF_STUDENTS);

    if (lastIndex != -1){
        String number = numOfStudents.substring((lastIndex + (NUM_OF_STUDENTS.length())) , numOfStudents.length());
        Integer yourResultNumber = Integer.parseInt(number);
        System.out.println(yourResultNumber);
    }