将用户输入的名称与存储在名称数组中的所有名称进行比较。

Question

我正试着写一个程序来检查两名员工的工资。因此，我首先接受名为employeeName的数组中的所有员工的名称，以及名为AnnualSales的数组中的员工的sales。当我试图用存储在employeeName数组中的名称检查用户输入的名称时，我将面临问题。

import java.util.Scanner;

public class Array {

    public static void main(String[] args) {

        int numberOfEmployees;                              // will store the number of employees
        int compare;                                        // number of employees you want to compare results to

        //Scanner class enables user input
        Scanner sp = new Scanner(System.in);

        System.out.println("Enter the number of employees: ");
        numberOfEmployees = sp.nextInt();

        String[] employeeName = new String[numberOfEmployees];              // this string array will store the name of employees
        double[] AnnualSales = new double[numberOfEmployees];               // this will store the sales of every individual employee

这将存储所有的employeeNames和它们的AnnualSales。

        for(int i = 0 ; i < numberOfEmployees ; i++) {

            System.out.printf("Enter name of employee %d: ",i+1);
            employeeName[i] = sp.next();

            System.out.printf("Enter salary of employee %d: ",i+1);
            AnnualSales[i] = sp.nextDouble();

        }

        System.out.println("Enter the number of employees you want to compare records of: ");
        compare = sp.nextInt();

        if(compare > numberOfEmployees) {

            System.out.println("IndexOutOfBound");
            System.exit(0);
        }

        String[] comparison = new String[compare];

        for(int i = 0; i < compare; i++) {

            System.out.printf("Enter name of employee %d for comparison: ",i+1);
            comparison[i] = sp.next();

            // a loop to go through all the names in the employeeName array
            System.out.println(comparison[i]);

我只想检查雇员的名字是否已经在employeeName数组中了。下面的if条件存在于比较employeeName数组中的第一个名称时，但我希望检查特定雇员的名称和employeeName数组中的所有员工。

            for(int j = 0 ; j < numberOfEmployees ; j++) {  
                if(comparison[i] != employeeName[j]) {
                    System.out.println("Employee does not exist!");
                    System.exit(0);
                }
            }
        }

        // compare salary of 2 employees

        if(AnnualSales[compare-1] > AnnualSales[compare-2]) {

            System.out.printf("Sales of %s are greater than %s",employeeName[compare-1], employeeName[compare-2]);
        }else {
            System.out.printf("Sales of %s are less than %s",employeeName[compare-1], employeeName[compare-2]);
        }

        sp.close();
    }
}

Answer 1

不要像这样将字符串与==进行比较：

comparison[i] != employeeName[j]

使用equals()代替：

!comparison[i].equals(employeeName[j])

Answer 2

You need to correct this as:
    for(int j = 0 ; j < numberOfEmployees ; j++) {  
if(!comparison[i].equals(employeeName[j])) {
                        System.out.println("Employee does not exist!");
                        System.exit(0);
                    }
                }
            }
    **Output after changing this condition of your code:**
    Enter the number of employees: 
    3
    Enter name of employee 1: a
    Enter salary of employee 1: 1
    Enter name of employee 2: b
    Enter salary of employee 2: 2
    Enter name of employee 3: c
    Enter salary of employee 3: 3
    Enter the number of employees you want to compare records of: 
    2
    Enter name of employee 1 for comparison: a
    a
    Employee does not exist!