因为任何类,默认都是已经实现了equals(Object obj)的。 Java中的一切类都是继承于java.lang.Object,在Object.java中实现了equals(Object obj)函数;所以,其它所有的类也相当于都实现了该函数。 (02) int compare(T o1, T o2) 是“比较o1和o2的大小”。返回“负数”,意味着“o1比o2小”;返回“零”,意味着...
The sorting order is decided by the return value of thecompareTo()method.TheInteger.compare(x, y)returns -1 ifxis less thany, 0 if they’re equal, and 1 otherwise. The method returns a number indicating whether the object being compared is less than, equal to, or greater than the obje...
The method sort(List) in the type Collections is not applicable for the arguments (ArrayList) 下面我们解释我们那里出错了。 Comparable 见名思意,Comparable接口定义了相同两个对象之间比较策略,称为类的“自然排序”。因此为了排序,我们必须让Player对象实现Comparable接口: public class Player implements Comparabl...
This interface imposes a total ordering on the objects of each class that implements it. This ordering is referred to as the class'scompareTomethod is referred to as itsnatural comparison method. public interfaceComparator<T> A comparison function, which imposes atotal orderingon some collection ...
无法转换为 java.lang.Comparable 虽然这个问题已经被问到,但我有一个具体实施的疑问。 我正在尝试打印二叉树的顶视图,下面是它的完整代码: import java.util.*; class Node{ int data; Node right; Node left; Node(int data){ this.data = data;...
[java] view plain copy package cn.com.qiang.neibulei2; public class MyOuter2 { public static int x=100; public static class MyInner{ private String y="Hello!"; public void innerMethod(){ System.out.println("我是内部类 x = "+x); ...
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 ...
When we say that a class's natural ordering is consistent with equals, we mean that the quotient for the natural ordering is the equivalence relation defined by the class's equals(Object) method: {(x, y) such that x.equals(y)}. This interface is a member of the Java Collections ...
maps) without explicit comparators behave "strangely" when they are used with elements (or keys) whose natural ordering is inconsistent with equals. In particular, such a sorted set (or sorted map) violates the general contract for set (or map), which is defined in terms of theequalsmethod....
Comparable :This interface has one methodcompareTo.Class whose objects to be sorted must implement this Comparable interface. In this case there is one form or way of sorting, e.g. We can sort players by age, so if we want to sort them by ranking or by name, in this case we have t...