Java 中的 TreeSet descendingIterator()方法，示例
原文:https://www . geeksforgeeks . org/treeset-dependingiterator-method-in-Java-with-examples/
Java . util . treeset<【E】>类的Degending Terrar()方法用于以降序返回该集合中元素的迭代器。 语法:
public Iterator descendingIterator()
返回值:这个方法以降序返回这个集合中元素的迭代器。 以下是举例说明下降法方法 例 1:
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to demonstrate
// descendingIterator() method
// for Integer value
import java.util.*;
public class GFG1 {
public static void main(String[] argv) throws Exception
{
try {
// create tree set object
TreeSet<Integer> treeadd = new TreeSet<Integer>();
// populate the TreeSet using add() method
treeadd.add(10);
treeadd.add(20);
treeadd.add(30);
treeadd.add(40);
// Print the TreeSet
System.out.println("TreeSet: " + treeadd);
// create descending iterator
// using descendingIterator() method
Iterator<Integer>
iterator = treeadd.descendingIterator();
System.out.println("\nValues using DescendingIterator:");
// printing the integrated value
while (iterator.hasNext()) {
System.out.println("Value : "
+ iterator.next());
}
}
catch (NullPointerException e) {
System.out.println("Exception thrown : " + e);
}
}
}
Output:
TreeSet: [10, 20, 30, 40]
Values using DescendingIterator:
Value : 40
Value : 30
Value : 20
Value : 10
例 2:
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to demonstrate
// descendingIterator() method
// for String value
import java.util.*;
public class GFG1 {
public static void main(String[] argv) throws Exception
{
try {
// create tree set object
TreeSet<String> treeadd = new TreeSet<String>();
// populate the TreeSet using add() method
treeadd.add("A");
treeadd.add("B");
treeadd.add("C");
treeadd.add("D");
// Print the TreeSet
System.out.println("TreeSet: " + treeadd);
// create descending iterator
// using descendingIterator() method
Iterator<String>
iterator = treeadd.descendingIterator();
System.out.println("\nValues using DescendingIterator:");
// printing the integrated value
while (iterator.hasNext()) {
System.out.println("Value : "
+ iterator.next());
}
}
catch (Exception e) {
System.out.println("Exception thrown : " + e);
}
}
}
Output:
TreeSet: [A, B, C, D]
Values using DescendingIterator:
Value : D
Value : C
Value : B
Value : A
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