Java中的 CompositeName isEmpty() 方法和示例
javax.naming.CompositeName 类的isEmpty()方法用于检查此复合名称对象是否为空。如果复合名称的组成部分为零,则称复合名称为空。
句法:
public boolean isEmpty()
参数:此方法不接受任何内容。
返回值:如果此复合名称为空,则此方法返回 true,否则返回 false。
下面的程序说明了 CompositeName.isEmpty() 方法:
方案一:
// Java program to demonstrate
// CompositeName.isEmpty()
import java.util.Properties;
import javax.naming.CompositeName;
import javax.naming.InvalidNameException;
public class GFG {
public static void main(String[] args)
throws InvalidNameException
{
// create composite name object
CompositeName CompositeName1
= new CompositeName("a/b/z/y/x");
// apply isEmpty()
boolean isEmpty
= CompositeName1.isEmpty();
// print value
System.out.println(
"This composite "
+ "object is empty: " + isEmpty);
}
}
输出:
This composite object is empty: false
方案二:
// Java program to demonstrate
// CompositeName.isEmpty() method
import java.util.Properties;
import javax.naming.CompositeName;
import javax.naming.InvalidNameException;
public class GFG {
public static void main(String[] args)
throws InvalidNameException
{
// create composite name object
CompositeName CompositeName1
= new CompositeName("");
// apply isEmpty()
boolean isEmpty
= CompositeName1.isEmpty();
// print value
System.out.println(
"This composite "
+ "object is empty: "
+ isEmpty);
}
}
输出:
This composite object is empty: true
参考资料:https://docs.oracle.com/javase/10/docs/api/javax/naming/CompositeName.html#isEmpty()