java - 为什么我的异常(exception)不起作用

Question

如果输入的客户名称为 null，则应该抛出异常，但我的代码不起作用。

public class CustomerAccount {
    private String name;

    public CustomerAccount(String name) throws IllegalArgumentException {

        this.setName(name);
    }

    public String getName() {
        return name;
    }

    public void setName(String name) throws IllegalArgumentException {
        try {
            this.name = name;

        }

        catch (IllegalArgumentException illegal) {
            if (name == "" || name == null) {
                System.err.println("please do not enter the empty string" + illegal);
            }

        }
    }

    public String toString() {
        return "Name: " + this.getName();
    }

    public static void main(String[] args) {
        CustomerAccount c1 = new CustomerAccount("random name");

        c1.setName(null);
        System.out.println(c1);
    }
}

Answer 1

如果名称为 null 或为空(该方法中没有 try/catch)，setName 应该简单地抛出 IllegalArgumentException。

public void setName(String name) throws IllegalArgumentException {
   if ("".equals(name) || name == null) {
    throw new IllegalArgumentException("Name should not be null or empty");
   }
   this.name=name;

 }