Java TreeSet subSet() 方法

2024年11月7日 | 5 分钟阅读

TreeSet 类的 subSet() 方法用于获取范围在 fromElement 和 toElement 之间的集合元素。

语法

public SortedSet<E> subSet(E fromElement,
                           E toElement)

参数

fromElement - 返回集合的最小端点

toElement - 返回集合的最大端点。

它返回范围在 fromElement 和 toElement 之间的集合。

抛出

ClassCastException：当 fromElement 和 toElement 的范围无法与集合中存在的元素进行比较时，抛出异常。

NullPointerException：当 fromElement 或 toElement 为 null 时，抛出异常。

IllegalArgumentException：当 fromElement 大于 toElement 或超出范围时，抛出异常。

示例 1

import java.util.*;
public class JavaTreeSetSubSetExample1
{
  public static void main(String as[]){
  TreeSet <Integer>obj = new TreeSet<Integer>();
  TreeSet <Integer>obj1 = new TreeSet<Integer>();
  obj.add(4);	
  obj.add(6);
  obj.add(9);
  obj.add(12);
  obj.add(18);
  System.out.println("TreeSet: " +obj);
  obj1=(TreeSet<Integer>) obj.subSet(6,12);
  System.out.println("Elements of  TreeSet: " +obj1);
  }
}

输出

TreeSet: [4, 6, 9, 12, 18]
Elements of  TreeSet: [6, 9]

示例 2

import java.util.*;
public class JavaTreeSetsubSetExample2
{
  public static void main(String as[]){
  TreeSet <String> obj = new TreeSet<String>();
  TreeSet <String> obj1 = new TreeSet<String>();
  obj.add("B");	
  obj.add("9");
  obj.add("1");
  obj.add("b");
  obj.add("A");
  obj.add("a");
  obj.add("6");
  obj.add("3");
  System.out.println("TreeSet: " +obj);
obj1=(TreeSet<String>) obj.subSet("3","a");
  System.out.println("Elements of  TreeSet: " +obj1);
  }
}

输出

TreeSet: [1, 3, 6, 9, A, B, a, b]
Elements of  TreeSet: [3, 6, 9, A, B]

示例 3

import java.util.*;
class student{  
    private int roll_no;  
    private String name;  
    private String sem; 
    private String branch;
    public student(int roll_no, String name, String sem,String branch ) {  
        this.roll_no = roll_no;  
        this.name = name;  
        this.sem = sem;  
        this.branch=branch;
    }  
   
    public String toString(){  
       return roll_no+"  " +name+"  "+sem+" "+branch;  
    }  
}  
public class student_1 {  
    public static void main(String[] args) {  
        student stu1 = new student(001, "Shristee", "III", "B.tech(C.S)");  
        student stu2 = new student(002, "Shweta  ", "I  ", "B.tech(I.t)");  
        student stu3 = new student(003, "Suma    ", "II ", "Msc(I.t)");  
        student stu4 = new student(004, "Dolly   ", "V  ", "MCA");
          TreeSet <String> obj = new TreeSet<>();
           TreeSet <String> obj1 = new TreeSet<>();
          String s1=stu1.toString();
          String s2=stu2.toString();
          String s3=stu3.toString();
          String s4=stu4.toString();
         obj.add(s1);  
        obj.add(s2);  
        obj.add(s3);  
        obj.add(s4);
        System.out.println("Elements in TreeSet: ");
        for (String xyz : obj) {  
            System.out.println(xyz);  
        }
        obj1=(TreeSet<String>) obj.subSet(s2,s4);
  System.out.println("Elements of  TreeSet: " +obj1);
    }  
}  

输出

Elements in TreeSet: 
1  Shristee  III B.tech(C.S)
2  Shweta    I   B.tech(I.t)
3  Suma      II  Msc(I.t)
4  Dolly     V   MCA
Elements of  TreeSet: [2  Shweta    I   B.tech(I.t), 3  Suma      II  Msc(I.t)]

Java TreeSet subSet() 方法

TreeSet 类的 subSet() 方法用于获取集合中范围在 fromElement 和 toElement 之间的元素。如果 fromElement 和 toElement 相等，并且 fromInclusive 和 toInclusive 都为 true，则返回 null 集。

语法

public NavigableSet<E> subSet(E fromElement,
                              boolean fromInclusive,
                              E toElement,
                              boolean toInclusive)

参数

fromElement - 返回集合的最小端点

fromInclusive - 如果最小端点要包含在返回的视图中，则为 true

toElement - 返回集合的最大端点。

toInclusive - 如果最大端点要包含在返回的视图中，则为 true

它返回范围在 fromElement 和 toElement 之间的集合。

抛出

ClassCastException：当 fromElement 和 toElement 的范围无法与集合中存在的元素进行比较时，抛出异常。

NullPointerException：当 fromElement 或 toElement 为 null 时，抛出异常。

IllegalArgumentException：当 fromElement 大于或等于 toElement 且超出范围时，抛出异常。

示例 1

import java.util.*;
public class JavaTreeSetNavigableSetSubSetExample1
{
  public static void main(String as[]){
  TreeSet <Integer>obj = new TreeSet<Integer>();
  TreeSet <Integer>obj1 = new TreeSet<Integer>();
  TreeSet <Integer>obj2 = new TreeSet<Integer>();
  TreeSet <Integer>obj3 = new TreeSet<Integer>();
  TreeSet <Integer>obj4 = new TreeSet<Integer>();
  obj.add(4);	
  obj.add(6);
  obj.add(9);
  obj.add(12);
  obj.add(18);
  obj.add(3);
  obj.add(2);
  obj.add(13);
  obj.add(16);
  obj.add(25);
  obj.add(16);
  System.out.println("TreeSet: " +obj);
  obj1=(TreeSet<Integer>) obj.subSet(4, true, 15, true);
  obj2=(TreeSet<Integer>) obj.subSet(4, false, 15, false);
  obj3=(TreeSet<Integer>) obj.subSet(4, true, 15, false);
  obj4=(TreeSet<Integer>) obj.subSet(4, false, 15, true);
  System.out.println("Elements in TreeSet object 1"+obj1);
  System.out.println("Elements in TreeSet object 2"+obj2);
  System.out.println("Elements in TreeSet object 3"+obj3);
  System.out.println("Elements in TreeSet object 4"+obj4);
  }
}

输出

TreeSet: [2, 3, 4, 6, 9, 12, 13, 16, 18, 25]
Elements in TreeSet object 1[4, 6, 9, 12, 13]
Elements in TreeSet object 2[6, 9, 12, 13]
Elements in TreeSet object 3[4, 6, 9, 12, 13]
Elements in TreeSet object 4[6, 9, 12, 13]

示例 2

import java.util.*;
public class JavaTreeSetNavigableSetSubSetExample2
{
  public static void main(String as[]){
  TreeSet <String> obj = new TreeSet<String>();
  TreeSet <String> obj1 = new TreeSet<String>();
  TreeSet <String> obj2 = new TreeSet<String>();
   TreeSet <String> obj3 = new TreeSet<String>();
   TreeSet <String> obj4 = new TreeSet<String>();
  obj.add("B");	
  obj.add("9");
  obj.add("1");
  obj.add("b");
  obj.add("A");
  obj.add("a");
  obj.add("6");
  obj.add("3");
  System.out.println("TreeSet: " +obj);
  obj1=(TreeSet<String>) obj.subSet("3", true, "a", true);
  obj2=(TreeSet<String>) obj.subSet("3", false, "a", false);
  obj3=(TreeSet<String>) obj.subSet("3", true, "a", false);
  obj4=(TreeSet<String>) obj.subSet("3", false, "a", true);
  System.out.println("Elements in TreeSet object 1"+obj1);
  System.out.println("Elements in TreeSet object 2"+obj2);
  System.out.println("Elements in TreeSet object 3"+obj3);
  System.out.println("Elements in TreeSet object 4"+obj4);
  }
}

输出

TreeSet: [1, 3, 6, 9, A, B, a, b]
Elements in TreeSet object 1[3, 6, 9, A, B, a]
Elements in TreeSet object 2[6, 9, A, B]
Elements in TreeSet object 3[3, 6, 9, A, B]
Elements in TreeSet object 4[6, 9, A, B, a]

示例 3

import java.util.*;
class book{  
    private int b_id;
    private int price;
    private String b_name;  
    private String title;  
    public book(int b_id, String b_name, String title, int price) {  
        this.b_id=b_id;
        this.b_name=b_name;
        this.title=title;
        this.price=price;
    }  
   
    public String toString(){ 
       return b_id+" "+b_name+" "+title+" "+price;
    }  
}  
public class JavaTreeSetNavigableSetSubSetExample3{  
    public static void main(String[] args) {
        book b1=new book(001, "C", "Programming in C", 200);
        book b2=new book(002, "C++", "Programming in C++", 340);
        book b3=new book(003, "VB", "Programming in Visual Basic", 300);
        book b4=new book(004, "Java", "Programming in JAVA", 400);
        book b5=new book(005, "DS", "Data Structure", 400);
        book b6=new book(006, "SAD", "System Analysis and Design ", 400);
        book b7=new book(007, "SE", "Software eEngineering", 400);
          TreeSet <String> obj = new TreeSet<String>(); 
           TreeSet <String> obj1 = new TreeSet<String>();
            TreeSet <String> obj2 = new TreeSet<String>();
             TreeSet <String> obj3 = new TreeSet<String>();
              TreeSet <String> obj4 = new TreeSet<String>();
          String s1=b1.toString();
          String s2=b2.toString();
          String s3=b3.toString();
          String s4=b4.toString();
          String s5=b5.toString();
          String s6=b6.toString();
          String s7=b7.toString();
         obj.add(s1);  
        obj.add(s2);  
        obj.add(s3);
        obj.add(s4);
        obj.add(s5);
        obj.add(s6);
        obj.add(s7);
        System.out.println("Elements in TreeSet: ");
        for (String xyz : obj) {  
            System.out.println(xyz);  
        }
        obj1=(TreeSet<String>) obj.subSet(s2, true, s6, true);
        obj2=(TreeSet<String>) obj.subSet(s2, false, s6, false);
        obj3=(TreeSet<String>) obj.subSet(s2, true, s6, false);
        obj4=(TreeSet<String>) obj.subSet(s2, false, s6, true);
        System.out.println("Elements in TreeSet object 1"+obj1);
  System.out.println("Elements in TreeSet object 2"+obj2);
  System.out.println("Elements in TreeSet object 3"+obj3);
  System.out.println("Elements in TreeSet object 4"+obj4);      
    }  
}  

输出

Elements in TreeSet: 
1 C Programming in C 200
2 C++ Programming in C++ 340
3 VB Programming in Visual Basic 300
4 Java Programming in JAVA 400
5 DS Data Structure 400
6 SAD System Analysis and Design  400
7 SE Software eEngineering 400
Elements in TreeSet object 1[2 C++ Programming in C++ 340, 3 VB Programming in Visual Basic 300,
 4 Java Programming in JAVA 400, 5 DS Data Structure 400, 6 SAD System Analysis and Design  400]
Elements in TreeSet object 2[3 VB Programming in Visual Basic 300, 4 Java Programming in JAVA 400, 
5 DS Data Structure 400]
Elements in TreeSet object 3[2 C++ Programming in C++ 340, 3 VB Programming in Visual Basic 300, 
4 Java Programming in JAVA 400, 5 DS Data Structure 400]
Elements in TreeSet object 4[3 VB Programming in Visual Basic 300, 4 Java Programming in JAVA 400, 
5 DS Data Structure 400, 6 SAD System Analysis and Design  400]

下一主题Java-treeset-tailset-method

Java TreeSet subSet() 方法

语法

参数

返回

抛出

示例 1

示例 2

示例 3

Java TreeSet subSet() 方法

语法

参数

返回

抛出

示例 1

示例 2

示例 3

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Java TreeSet subSet() 方法

语法

参数

返回

抛出

示例 1

示例 2

示例 3

Java TreeSet subSet() 方法

语法

参数

返回

抛出

示例 1

示例 2

示例 3

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