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Java Collections方法使用自定义Comparator对象排序。

欢马劈雪

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Collections方法使用自定义比较器对象排序。

实例源码：

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import java.util.ArrayList;

import java.util.Collections;

import java.util.List;
/*来自 nowjava - 时  代  Java*/

public class Main {

public static void main(String[] args) {

List<Time> list = new ArrayList<>(); // create List

list.add(new Time(6, 24, 34));

list.add(new Time(18, 14, 58));

list.add(new Time(16, 15, 34));

list.add(new Time(12, 14, 58));

list.add(new Time(6, 24, 22));/** 来自 NowJava.com**/

// output List elements

System.out.printf("Unsorted array elements:%n%s%n", list);

// sort in order using a comparator

Collections.sort(list, new TimeComparator());

// output List elements

System.out.printf("Sorted list elements:%n%s%n", list);

}

class Time {

private int hour; // 0 - 23

private int minute; // 0 - 59

private int second; // 0 - 59

// Time2 no-argument constructor:

// initializes each instance variable to zero

public Time() {

this(0, 0, 0); // invoke Time2 constructor with three arguments

}

// Time2 constructor: hour supplied, minute and second defaulted to 0

public Time(int h) {

this(h, 0, 0); // invoke Time2 constructor with three arguments

}

// Time2 constructor: hour and minute supplied, second defaulted to 0

public Time(int h, int m) {

this(h, m, 0); // invoke Time2 constructor with three arguments

}

// Time2 constructor: hour, minute and second supplied

public Time(int h, int m, int s) {

setTime(h, m, s); // invoke setTime to validate time

}

// Time2 constructor: another Time2 object supplied

public Time(Time time) {

// invoke Time2 three-argument constructor

this(time.getHour(), time.getMinute(), time.getSecond());

}

// Set Methods

// set a new time value using universal time;

// validate the data

public void setTime(int h, int m, int s) {

setHour(h); // set the hour

setMinute(m); // set the minute

setSecond(s); // set the second

}

// validate and set hour

public void setHour(int h) {

if (h >= 0 && h < 24)

hour = h;

else

throw new IllegalArgumentException("hour must be 0-23");

}

// validate and set minute

public void setMinute(int m) {

if (m >= 0 && m < 60)

minute = m;

else

throw new IllegalArgumentException("minute must be 0-59");

}

// validate and set second

public void setSecond(int s) {

if (s >= 0 && s < 60)

second = ((s >= 0 && s < 60) ? s : 0);

else

throw new IllegalArgumentException("second must be 0-59");

}

// get hour value

public int getHour() {

return hour;

}

// get minute value

public int getMinute() {

return minute;

}

// get second value

public int getSecond() {

return second;

}

// convert to String in universal-time format (HH:MM:SS)

public String toUniversalString() {

return String.format("%02d:%02d:%02d", getHour(), getMinute(), getSecond());

}

// convert to String in standard-time format (H:MM:SS AM or PM)

public String toString() {

return String.format("%d:%02d:%02d %s",

((getHour() == 0 || getHour() == 12) ? 12 : getHour() % 12),
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编辑于 2020-03-26 09:23:272020-03-26 09:23:27

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