泛型list中汉字按首字母排序

首先拼音排序需要用到pinyin4j的jar

有一个转换为字母的方法PinyinHelper.toHanyuPinyinStringArray

实现排序两种方式

1. Bank类实现Comparable接口重写其compareTo方法 调用Collections.sort(list);即可

2. 传入自定义比较器(类似如下写法)

       Collections.sort(list,, new Comparator(){
            public int compare(Bank o1, Bank o2) {
                return null;
            }
        })

import java.util.ArrayList;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

import sun.org.mozilla.javascript.internal.NativeArray;
import sun.org.mozilla.javascript.internal.NativeObject;

public class Test6
{
	public static void main(String[] args)
	{
		Bank bank1 = new Bank();
		Bank bank2 = new Bank();
		Bank bank3 = new Bank();
		Bank bank4 = new Bank();
		bank1.setBankname("浙商银行");
		bank1.setBankcode("316290088001");
		bank2.setBankname("上海农商银行");
		bank2.setBankcode("402290088001");
		bank3.setBankname("农业银行");
		bank3.setBankcode("103290088001");
		bank4.setBankname("中国工商银行");
		bank4.setBankcode("102290088001");
		ArrayList list = new ArrayList();
		list.add(bank1);
		list.add(bank2);
		list.add(bank3);
		list.add(bank4);
		System.out.println(list);
		String jsonstr = list.toString();
		ScriptEngineManager sem = new ScriptEngineManager();
		ScriptEngine se = sem.getEngineByName("js");
		String fun = "var arr="
		        + jsonstr
		        + ";arr.sort(function(a,b){var an = a.bankname,bn=b.bankname;if(an.localeCompare(bn)>0){return 1;}else if(an.localeCompare(bn)<0){return -1;}else{return 0;}});";
		try
		{
			NativeArray na = (NativeArray) se.eval(fun);
			for(int i = 0; i < na.getLength(); i++)
			{
				NativeObject object = (NativeObject) na.get(i, null);
				Object[] ids = object.getIds();
				Bank bank = new Bank();
				bank.setBankname(object.get(ids[0].toString(), null).toString());
				bank.setBankcode(object.get(ids[1].toString(), null).toString());
				list.set(i, bank);
			}
		}
		catch(ScriptException e)
		{
			e.printStackTrace();
		}
		System.out.println(list);
	}
}

class Bank
{
	private String bankname;

	private String bankcode;

	public String getBankname()
	{
		return bankname;
	}

	public void setBankname(String bankname)
	{
		this.bankname = bankname;
	}

	public String getBankcode()
	{
		return bankcode;
	}

	public void setBankcode(String bankcode)
	{
		this.bankcode = bankcode;
	}

	@Override
	public String toString()
	{
		return String.format("{\"bankname\":\"%s\", \"bankcode\":\"%s\"}", bankname, bankcode);
	}
}

Collections.sort(list, new Sort()); 自定义排序
排序实现
class Sort implements Comparator {
public int compare(Bank o1, Bank o2) {
char c1 = o1.getBankname().charAt(0);
char c2 = o2.getBankname().charAt(0);
return concatPinyinStringArray(net.sourceforge.pinyin4j.PinyinHelper.toHanyuPinyinStringArray(c1)).compareTo(concatPinyinStringArray(net.sourceforge.pinyin4j.PinyinHelper.toHanyuPinyinStringArray(c2)));
}
}