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为啥我仿照String的compareTo，写一个帮助类，省略this，不能用？

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#1 Created at ... [Delete] [Delete and Lock User] 
public class Main {

	public static void main(String[] args) {
		String[] array = new String[] { "apple", "Orange", "banana", "Lemon" };
		// 请使用忽略大小写排序，并改写为方法引用:
		Arrays.sort(array, helper::compare);
		System.out.println(String.join(", ", array));
	}
}



public class helper {
	private String helpp;
	
	public helper() {
		this.helpp = "aa";
	}
	public int compare(String b) {
		return this.helpp.toLowerCase().compareTo(b.toLowerCase());
	}
}

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#2 Created at ... [Delete] [Delete and Lock User]

因为main是按照String排的，不是按照helper排的，改成按照helper排的，就可以了

Joker.fu_95

#3 Created at ... [Delete] [Delete and Lock User]

你这不是多此一举吗

保持热爱

#4 Created at ... [Delete] [Delete and Lock User]

方法签名不一样

花间的酒

#5 Created at ... [Delete] [Delete and Lock User]

这个帮助类的 this是 Helper类型吧，不是 String 类型

public int compare(Helper this, String b)
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