Set

Book

package bean;import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;@Data
@NoArgsConstructor
@AllArgsConstructor
public class Book implements Comparable {/*** 书名*/private String name;/*** 作者*/private String author;/*** 单价*/private int price;/*** 销量*/private int sales;@Overridepublic int compareTo(Object o) {Book book = (Book) o;int x = this.author.compareTo(book.getAuthor());int y = this.price - book.getPrice();int z = this.sales - book.getSales();int k = this.name.compareTo(book.getName());if (x != 0) {return x;} else if (y != 0) {return -y;} else if (z != 0) {return -z;} else if (k != 0) {return k;} else {return 0;}}
}

TreeSetTest

package Test.set;import bean.Book;
import org.junit.jupiter.api.Test;import java.util.Iterator;
import java.util.Set;
import java.util.TreeSet;public class TreeSetTest {@Testpublic void test(){Set<Book> books = new TreeSet<>();// books.add(new Book("f", "B", 35, 180));books.add(new Book("a", "A", 35, 150));books.add(new Book("b", "B", 35, 150));books.add(new Book("c", "A", 33, 150));books.add(new Book("d", "B", 33, 150));books.add(new Book("e", "A", 35, 180));books.add(new Book("f", "B", 35, 180));Iterator<Book> it = books.iterator();while (it.hasNext()){Book book = it.next();System.out.println(book);}/*
Book(name=e, author=A, price=35, sales=180)
Book(name=a, author=A, price=35, sales=150)
Book(name=c, author=A, price=33, sales=150)
Book(name=f, author=B, price=35, sales=180)
Book(name=b, author=B, price=35, sales=150)
Book(name=d, author=B, price=33, sales=150)*/}
}

LinkedHashSetTest

package Test.set;import org.junit.jupiter.api.Test;import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Set;/*** List： 有序可重复 有序指的是下标有序 可重复指的是不同下标位置上可以存储相同值的元素* Set： 无序不可重复 录入的顺序和存储的顺序不一致 不可重复指的是相同值的元素不可重复存储*/
public class LinkedHashSetTest {@Testpublic void test01() {Set set = new HashSet();byte a = 1;short b = 2;int c = 3;long d = 4L;double e = 5.0d;float f = 6.0f;char g = 'a';boolean h = false;set.add(a);set.add(b);set.add(c);set.add(d);set.add(e);set.add(f);set.add(g);set.add(h);set.add(a);System.out.println(set);}
//[6.0, 1, a, 2, 3, 4, 5.0, false]@Testpublic void test02() {Set set = new LinkedHashSet();byte a = 1;short b = 2;int c = 3;long d = 4L;double e = 5.0d;float f = 6.0f;char g = 'a';boolean h = false;set.add(a);set.add(b);set.add(c);set.add(d);set.add(e);set.add(f);set.add(g);set.add(h);set.add(a);System.out.println(set);}
//[1, 2, 3, 4, 5.0, 6.0, a, false]@Testpublic void test03() {Set set = new LinkedHashSet();set.add(2);set.add(1);set.add(1);System.out.println(set);}
//[2, 1]@Testpublic void test04() {Set<String> set = new LinkedHashSet<>();for (int i = 0; i < 5; i++) {set.add("xm" + (i + 1));}System.out.println(set);for (String name : set) {System.out.println(name);}}
/*
[xm1, xm2, xm3, xm4, xm5]
xm1
xm2
xm3
xm4
xm5*/@Testpublic void test05() {Set<String> set = new LinkedHashSet<>();for (int i = 0; i < 5; i++) {set.add("xm" + (i + 1));}System.out.println(set);Iterator<String> it = set.iterator();while (it.hasNext()) {String name = it.next();System.out.println(name);}}
/*
[xm1, xm2, xm3, xm4, xm5]
xm1
xm2
xm3
xm4
xm5*/
}

HashSetTest

package Test.set;import org.junit.jupiter.api.Test;import java.util.*;/*** List： 有序可重复 有序指的是下标有序 可重复指的是不同下标位置上可以存储相同值的元素* Set： 无序不可重复 录入的顺序和存储的顺序不一致 不可重复指的是相同值的元素不可重复存储*/
public class HashSetTest {@Testpublic void test01() {List list = new ArrayList();byte a = 1;short b = 2;int c = 3;long d = 4L;double e = 5.0d;float f = 6.0f;char g = 'a';boolean h = false;list.add(a);list.add(b);list.add(c);list.add(d);list.add(e);list.add(f);list.add(g);list.add(h);list.add(a);System.out.println(list);}
//[1, 2, 3, 4, 5.0, 6.0, a, false, 1]@Testpublic void test02() {Set set = new HashSet();byte a = 1;short b = 2;int c = 3;long d = 4L;double e = 5.0d;float f = 6.0f;char g = 'a';boolean h = false;set.add(a);set.add(b);set.add(c);set.add(d);set.add(e);set.add(f);set.add(g);set.add(h);set.add(a);System.out.println(set);}
//[6.0, 1, a, 2, 3, 4, 5.0, false]@Testpublic void test03() {Set set = new HashSet();set.add(2);set.add(1);set.add(1);System.out.println(set);}
//[1, 2]@Testpublic void test04() {Set<String> set = new HashSet<>();for (int i = 0; i < 5; i++) {set.add("xm" + (i + 1));}System.out.println(set);for (String name : set) {System.out.println(name);}}
/*
[xm5, xm2, xm1, xm4, xm3]
xm5
xm2
xm1
xm4
xm3*/@Testpublic void test05() {Set<String> set = new HashSet<>();for (int i = 0; i < 5; i++) {set.add("xm" + (i + 1));}System.out.println(set);Iterator<String> it = set.iterator();while (it.hasNext()) {String name = it.next();System.out.println(name);}}
/*
[xm5, xm2, xm1, xm4, xm3]
xm5
xm2
xm1
xm4
xm3*/
}