java - 将字符串转换为整数。字符串值 = 扫描仪输入.....很难解释

Question

好吧，我正在尝试转换一些东西。

所以我已经将我的 Scanner 转换为字符串，现在我想要做的是，获取他们输入的值并将其用作其他几个 if 语句的整数。它不会起作用!

到目前为止，这是我的代码:

import java.util.Scanner;
public class apples {
public static void main(String args[]) {

    Scanner fname = new Scanner(System.in);
    Scanner sname = new Scanner(System.in);
    Scanner number = new Scanner(System.in);
    tuna weight = new tuna();

    System.out.println("Enter Your First Name: ");
    String fname1 = fname.nextLine();
    String fnames = fname1;

    System.out.println("Enter Your Last Name: ");
    String sname1 = sname.nextLine();
    String snames = sname1;

    System.out.println("Enter Your Weight (Lbs.) : ");
    String num = number.nextLine();
    String num1 = num;

    System.out.println("Okay " + fname1 + " " + sname1
            + " I can see here that you weigh " + num + "lbs.");
    int num2 = num1.parseInt();
    if (num1 >= 275)
        System.out
                .println("You know, you should maybe consider laying off the candy my friend.....");
}

Answer 1

你应该在 parseInt 中使用一个参数:

int num2 = Integer.parseInt(num1);

和

if (num2 >= 275) 
...