From the JavaDoc for the compareTo method in the Comparable interface: It is strongly recommended, but not strictly required that(x.compareTo(y)==0) == (x.equals(y)). Generally speaking, any class that implements the Comparable interface and violates this condition should clearly indicate this...
public interface Comparable<T> This interface imposes a total ordering on the objects of each class that implements it. This ordering is referred to as the class's natural ordering, and the class's compareTo me
Comparator: 是interface,一般通过实现匿名内部类,重写compare(),并作为sort方法的参数实现排序,是两个参数的比较 javaDoc: intcompare(To1,To2) Comparesitstwoargumentsfororder. Returnsanegativeinteger,zero,orapositiveintegerasthefirstargumentislessthan,equalto,orgreaterthanthesecond. 1. 2. 3. compare()返回...
ノート: このパッケージの宣言は、パッケージjdk.javadoc.docletの宣言に置き換えられました。 com.sun.jdi これは、Java Debug Interface (JDI)のコア・パッケージで、ブートストラップ機能以外に、値、型、およびターゲット仮想マシン自体のミラーを定義します。 com.sun.management このパ...
Field Detail INSTANCE public static final IncomparableComparator INSTANCE Constructor Detail IncomparableComparator public IncomparableComparator() Method Detail compare public int compare(Object o1, Object o2) Specified by: compare in interface Comparator...
Java Comparable Interface Comparable interface is a very important interface which can be used by Java Collections to compare custom objects and sort them. Using comparable interface, we can sort our custom objects in the same way how wrapper classes, string objects get sorted using Collections sort...
The TreeSet orders it's elements. To do that it either needs a Comparator or if you don't provide one the element-class must implement the Comparable interface. You didn't provide a Comparator so the TreeSet casted the element to a comparable and that caused the Exception because your cla...
是interface,一般通过实现匿名内部类,重写compare(),并作为sort方法的参数实现排序,是两个参数的比较 javaDoc: intcompare(T o1, T o2) Compares its two argumentsfororder. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the...
public interfaceComparable<T> 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. ...
ノート: このパッケージの宣言は、パッケージjdk.javadoc.docletの宣言に置き換えられました。 com.sun.jdi これは、Java Debug Interface (JDI)のコア・パッケージで、ブートストラップ機能以外に、値、型、およびターゲット仮想マシン自体のミラーを定義します。 com.sun.management このパ...