java的equals()方法。util。同时发生的ConcurrentSkipListSet是Java中的一个内置函数,它将指定的对象与该集合进行比较,以确定是否相等。如果指定的对象也是集合,则返回True。如果这两组满足以下所有条件,则称为相等:
null
- 这两套尺寸相同。
- 指定集合的每个成员都包含在此集合中。
此定义确保equals方法在set接口的不同实现中正常工作。
语法:
ConcurrentSkipListSet.equals(Object o)
参数: 该函数返回一个参数 o i、 e.要与该集合进行相等比较的对象
返回值: 该函数返回布尔值。如果指定的对象等于此集合,则返回true,否则返回false。
下面的程序演示了ConcurrentSkipListSet。equals()方法:
项目1: 在本例中,两个集合相等。
// Java Program Demonstrate equals() // method of ConcurrentSkipListSet import java.util.NavigableSet; import java.util.concurrent.ConcurrentSkipListSet; class ConcurrentSkipListSetEqualsExample1 { public static void main(String[] args) { // Initializing the set ConcurrentSkipListSet<Integer> set = new ConcurrentSkipListSet<Integer>(); // Adding elements to this set set.add( 10 ); set.add( 35 ); set.add( 20 ); set.add( 25 ); // Creating a descending set object NavigableSet<Integer> des_set = set.descendingSet(); // Checking if the set and des if (set.equals(des_set)) System.out.println( "Both the sets are equal" ); else System.out.println( "Both the sets are not equal" ); // Printing the elements of the set System.out.println( "Contents of the set: " + set); // Printing the elements of the descending set System.out.println( "Contents of the descending set: " + des_set); } } |
输出:
Both the sets are equal Contents of the set: [10, 20, 25, 35] Contents of the descending set: [35, 25, 20, 10]
项目2: 在这个例子中,两个集合并不相等
// Java Program Demonstrate equals() // method of ConcurrentSkipListSet import java.util.NavigableSet; import java.util.concurrent.ConcurrentSkipListSet; class ConcurrentSkipListSetEqualsExample2 { public static void main(String[] args) { // Initializing the set ConcurrentSkipListSet<Integer> set1 = new ConcurrentSkipListSet<Integer>(); ConcurrentSkipListSet<Integer> set2 = new ConcurrentSkipListSet<Integer>(); // Adding elements to first set set1.add( 10 ); set1.add( 35 ); set1.add( 20 ); set1.add( 25 ); // Adding elements to second set set2.add( 35 ); set2.add( 20 ); set2.add( 25 ); // Checking if the set and des if (set1.equals(set2)) System.out.println( "Both the sets are equal" ); else System.out.println( "Both the sets are not equal" ); // Printing the elements of the set System.out.println( "Contents of the first set: " + set1); // Printing the elements of the descending set System.out.println( "Contents of the second set: " + set2); } } |
输出:
Both the sets are not equal Contents of the first set: [10, 20, 25, 35] Contents of the second set: [20, 25, 35]
© 版权声明
文章版权归作者所有,未经允许请勿转载。
THE END