Java中的 Stack subList() 方法与示例

Java.util.Stack类的subList()方法用于返回此 Stack 在指定 fromIndex（包括）和 toIndex（不包括）之间部分的视图。 （如果 fromIndex 和 toIndex 相等，则返回的 Stack 为空。）

返回的 Stack 由此 Stack 支持，因此返回的 Stack 中的非结构性更改会反映在此 Stack 中，反之亦然。返回的 Stack 支持所有可选的 Stack 操作。

句法：

public Stack subList(int fromIndex, int toIndex)

参数：此方法将以下参数作为参数。

• fromIndex – subList 的低端点（包括）
• toIndex –子列表的高端（不包括）

返回值：此方法返回此堆栈中指定范围的视图。

异常：此方法引发以下异常。

• IndexOutOfBoundsException –如果端点索引值超出范围（fromIndex 大小）
• IllegalArgumentException –如果端点索引乱序（fromIndex > toIndex）

下面是说明subList()方法的示例。

示例 1：

// Java program to demonstrate
// subList() method
// for String value
  
import java.util.*;
  
public class GFG1 {
    public static void main(String[] argv)
        throws Exception
    {
  
        try {
  
            // Creating object of Stack
            Stack
                stack = new Stack();
  
            // Populating stack1
            stack.add("A");
            stack.add("B");
            stack.add("C");
            stack.add("D");
            stack.add("E");
  
            // print stack
            System.out.println("Original stack: "
                               + stack);
  
            // getting the subList
            // using subList() method
            List stack2 = stack.subList(2, 4);
  
            // print the subList
            System.out.println("SubStack of stack: "
                               + stack2);
        }
  
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出：

Original stack: [A, B, C, D, E]
SubStack of stack: [C, D]

示例 2：对于IndexOutOfBoundsException

// Java program to demonstrate
// subList() method
// for IndexOutOfBoundsException
  
import java.util.*;
  
public class GFG1 {
    public static void main(String[] argv)
        throws Exception
    {
        try {
  
            // Creating object of Stack
            Stack
                stack = new Stack();
  
            // Populating stack1
            stack.add("A");
            stack.add("B");
            stack.add("C");
            stack.add("D");
            stack.add("E");
  
            // print stack
            System.out.println("Original stack: "
                               + stack);
  
            // getting the subList
            // using subList() method
            System.out.println("\nEnd index value is out of range");
            List stack2 = stack.subList(2, 7);
  
            // print the subList
            System.out.println("SubStack of stack: "
                               + stack2);
        }
  
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出：

Original stack: [A, B, C, D, E]

End index value is out of range
java.lang.IndexOutOfBoundsException: toIndex = 7

示例 3：对于IllegalArgumentException

// Java program to demonstrate
// subList() method
// for IllegalArgumentException
  
import java.util.*;
  
public class GFG1 {
    public static void main(String[] argv) throws Exception
    {
        try {
  
            // Creating object of Stack
            Stack
                stack = new Stack();
  
            // Populating stack1
            stack.add("A");
            stack.add("B");
            stack.add("C");
            stack.add("D");
            stack.add("E");
  
            // print stack
            System.out.println("Original stack: "
                               + stack);
  
            // getting the subList
            // using subList() method
            System.out.println("\nEndpoint indices "
                               + "are out of order"
                               + " (fromIndex > toIndex)");
            List stack2 = stack.subList(7, 2);
  
            // print the subList
            System.out.println("SubStack of stack: "
                               + stack2);
        }
  
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出：

Original stack: [A, B, C, D, E]

Endpoint indices are out of order (fromIndex > toIndex)
java.lang.IllegalArgumentException: fromIndex(7) > toIndex(2)