[Java知识库]java List集合排序

使用Collections.sort进行排序

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class SetSortTools {
    public static List<BluetoothDevice> getListBluetoothDevice(){
        List<BluetoothDevice> bluetoothDeviceList=new ArrayList<>();
        bluetoothDeviceList.add(getBluetoothDevice("蓝牙1","xxx-xx-xx-xx-x-1",13));
        bluetoothDeviceList.add(getBluetoothDevice("蓝牙2","xxx-xx-xx-xx-x-1",14));
        bluetoothDeviceList.add(getBluetoothDevice("蓝牙7","xxx-xx-xx-xx-x-1",20));
        bluetoothDeviceList.add(getBluetoothDevice("蓝牙3","xxx-xx-xx-xx-x-1",16));
        bluetoothDeviceList.add(getBluetoothDevice("蓝牙4","xxx-xx-xx-xx-x-1",17));
        bluetoothDeviceList.add(getBluetoothDevice("蓝牙5","xxx-xx-xx-xx-x-1",17));
        bluetoothDeviceList.add(getBluetoothDevice("蓝牙6","xxx-xx-xx-xx-x-1",18));
        return bluetoothDeviceList;
    }
    private static BluetoothDevice getBluetoothDevice(String name,String address,int strength){
        BluetoothDevice mBluetoothDevice=new BluetoothDevice();
        mBluetoothDevice.setName(name);
        mBluetoothDevice.setAddress(address);
        mBluetoothDevice.setStrength(strength);
        return mBluetoothDevice;
    }
    public static List<BluetoothDevice> sortBluetoothList(List<BluetoothDevice> bluetoothDeviceList){
        Collections.sort(bluetoothDeviceList, new Comparator<BluetoothDevice>() {
            @Override
            public int compare(BluetoothDevice o1, BluetoothDevice o2) {
                //正序 从小到大排列
                //return o1.getStrength()-o2.getStrength();
                //倒序 从大到小排列
                return o2.getStrength()-o1.getStrength();
            }
        });
        for (int i = 0; i < bluetoothDeviceList.size(); i++) {
            System.out.println(bluetoothDeviceList.get(i).getName()+"===="+bluetoothDeviceList.get(i).getStrength()+"");
        }
        return bluetoothDeviceList;
    }
}

调用

assertEquals("蓝牙7", SetSortTools.sortBluetoothList(SetSortTools.getListBluetoothDevice()).get(0).getName())