Exception in thread"main"java.lang.ClassCastException: java4interview.Location cannot be cast to java.lang.Comparable 通过查看源码发现,在TreeSet调用add方法时,会调用到底层TreeMap的put方法,在put方法中会调用到compare(key, key)方法,进行key大小的比较;在比较的时候,会将传入的key进行类型强转,所以当我们...
This class is a member of theJava Collections Framework. Added in 1.2. Java documentation forjava.util.TreeSet. Portions of this page are modifications based on work created and shared by theAndroid Open Source Projectand used according to terms described in theCreative Commons 2.5 Attribution Lic...
// Java Program to Loop over TreeSet // Using Enhanced For loop // Importing required classes importjava.util.Iterator; importjava.util.TreeSet; // Main class publicclassGFG{ // Main driver method publicstaticvoidmain(String[]args) { // Creating an empty TreeSet by // declaring object o...
1packagejava.util;23publicclass TreeSet<E>extends AbstractSet<E>4implements NavigableSet<E>, Cloneable, java.io.Serializable5{6//NavigableMap对象7privatetransient NavigableMap<E,Object>m;89//TreeSet是通过TreeMap实现的,10//PRESENT是键-值对中的值。11privatestaticfinal Object PRESENT =newObject();...
Java 语言(一种计算机语言,尤用于创建网站)// Java program to Illustrate headSet() method // of TreeSet class In a sorted TreeSet // Importing required classes import java.io.*; import java.util.Iterator; import java.util.TreeSet; // Main class public class GFG { // Main driver method ...
Exception in thread "main" java.lang.ClassCastException: com.itheima.p6.Person cannot be cast to java.lang.Comparable at java.util.TreeMap.compare(TreeMap.java:1294) at java.util.TreeMap.put(TreeMap.java:538) at java.util.TreeSet.add(TreeSet.java:255) ...
public class TreeSet extends AbstractSet implements NavigableSet, Cloneable, java.io.Serializable 毫不意外的继承了抽象类AbstracSet,方便扩展; 实现了一个NavigableSet接口,和NavigableMap接口类似,提供了各种导航方法; 实现了Cloneable接口,可以克隆; 实现了Serializable接口,可以序列化; ...
Exception in thread "main" java.lang.ClassCastException: Users1 cannot be cast to java.lang.Comparable at java.util.TreeMap.compare(TreeMap.java:1294) at java.util.TreeMap.put(TreeMap.java:538) at java.util.TreeSet.add(TreeSet.java:255) ...
Exception in thread "main" java.lang.ClassCastException: com.frank.chapter22.TreeSetTest$Goods cannot be cast to java.lang.Comparable [Goods{name='Iphone4S', price=500.0}, Goods{name='Iphone5', price=800.0}, Goods{name='Iphone6S', price=2500.0}, Goods...
Exception in thread "main"java.lang.ClassCastException: com.frank.chapter22.TreeSetTest$Goods cannot be cast to java.lang.Comparable [Goods{name='Iphone4S', price=500.0}, Goods{name='Iphone5', price=800.0}, Goods{name='Iphone6S', price=2500.0}, Goods{name='Iphone7S', price=4500.0}, Go...