/*** 商品po类*/publicclassItemsimplementsjava.lang.Comparable<Items>{privateString title;privateinthits;privateDate pubTime;publicItems() {}publicItems(String title,inthits, Date pubTime) {super();this.title =title;this.hits =hits;this.pubTime =pubTime; }publicString getTitle() {returntitle;...
Comparable 接口中只有一个抽象方法:int compareTo(Object o);。 实现Comparable 的类必须实现 compareTo(Object o) 方法,两个对象即通过 compareTo(Object o) 方法的返回值来比较大小。 如果当前对象 this 大于形参对象 o ,则返回正整数, 如果当前对象 this 小于形参对象 o ,则返回负整数, 如果当前对象 this ...
单字段排序 下面是一个示例,演示了一个自定义类Person实现了Comparable接口,并使用compareTo方法按照年龄进行排序: AI检测代码解析 public class Person implements Comparable<Person> { private String name; private int age; // 构造函数、getter 和 setter 方法省略 @Override public int compareTo(Person other) ...
public int compareTo(Items o) { int result = 0; //按照生产时间降序 result = - this.pubTime.compareTo(o.pubTime); if(0==result){//如果生产时间相同 就按照销售量升序排列 result = this.hits-o.hits; if(0==result){//如果销售量相同 按照名字降序排列 result = - this.title.compareTo(o...
publicinterfaceComparable<T>{intcompareTo(Tt);} compareTo方法的通用约定与equals相似: 将此对象与指定的对象按照排序进行比较。 返回值可能为负整数,零或正整数,因为此对象对应小于,等于或大于指定的对象。 如果指定对象的类型与此对象不能进行比较,则引发ClassCastException异常(类转换异常)。
This interface imposes a total ordering on the objects of each class that implements it. This ordering is referred to as the class'snatural ordering, and the class'scompareTomethod is referred to as itsnatural comparison method. Lists (and arrays) of objects that implement this interface can ...
//Reverse of natural order as specified in//Comparable interface's compareTo() methodComparator.reversed();//Reverse of order by nameComparator.comparing(Employee::getName).reversed(); 3.5. Other Collection Classes Comparators can also be used to control the order of certain data structures (such...
1.2. Implementing Comparable Comparable interface has a single abstract method compareTo() that objects need to implement to have a natural ordering. The objects must be mutually comparable and must not throw ClassCastException for any key in the collection. The compareTo() method must return a...
@NoArgsConstructorpublicclassComparableImpl<T>implementsComparable<T>{@JsonIgnore String sortType;@JsonIgnore String orderBy;@OverridepublicintcompareTo(Tthat){if(orderBy==null){return0;}int order=-1;if("desc".equals(sortType)){order=1;}try{Class clazz=that.getClass();Field field=clazz.getDe...
CompareTo(Object) Method Reference Feedback Definition Namespace: Java.Nio.Charset Assembly: Mono.Android.dll C# 複製 int IComparable.CompareTo(Java.Lang.Object o); Parameters o Object Returns Int32 Implements CompareTo(Object) Remarks Portions of this page are modifications based on ...