Java 中的 Vector setSize()方法，示例
原文:https://www . geesforgeks . org/vector-set size-method-in-Java-with-example/
*。setSize()* 是向量类的一种方法，用于设置向量的新大小。如果向量的新大小大于当前大小，则向向量添加空元素。如果新大小小于当前大小，则删除所有高阶元素。
此方法将向量的大小修改为新大小，并且不返回任何内容。
*语法:*
public void setSize(int newSize)
*参数:*该方法接受向量的强制参数新大小。
*返回类型:* NA
*异常:*T2【arrayindexoofboundsexception
*注意:*如果新的大小是负的，那么它会抛出运行时错误****
*例 1:*
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program to Illustrate setSize() method
// of Vector class
// Importing required classes
import java.util.*;
// Main class
public class GFG {
// Main driver method
public static void main(String[] args)
{
// Creating object of Vector class
// Declaring object of string type
Vector<String> v = new Vector<String>();
// Inserting elements into the vector
// using add() method
// Custom input elements
v.add("Geeks");
v.add("for");
v.add("Geeks");
v.add("Computer");
v.add("Science");
v.add("Portal");
// Printing vector before calling setSize() method
System.out.println("Initially");
System.out.println("Vector: " + v);
System.out.println("Size: " + v.size());
// Setting new custom size
v.setSize(8);
// Printing vector after calling setSize()
System.out.println("\nAfter using setSize()");
System.out.println("Vector: " + v);
System.out.println("Size: " + v.size());
}
}
**Output
Initially
Vector: [Geeks, for, Geeks, Computer, Science, Portal]
Size: 6
After using setSize()
Vector: [Geeks, for, Geeks, Computer, Science, Portal, null, null]
Size: 8
```**
****例 2:** 当新尺寸为正时**
## **Java 语言(一种计算机语言，尤用于创建网站)**
```java
// Java program to Illustrate setSize() method
// of Vector class
// Where size is positive
// Importing utility classes
import java.util.*;
// Main class
public class GFG {
// amin driver method
public static void main(String[] args)
{
// Creating vector object of string type
Vector<String> v = new Vector<String>();
// Inserting elements into the vector
//. using add() method
// Custom input elements
v.add("Geeks");
v.add("for");
v.add("Geeks");
v.add("Computer");
v.add("Science");
v.add("Portal");
// Printing vector before calling setSize()
System.out.println("Initially");
System.out.println("Vector: " + v);
System.out.println("Size: " + v.size());
// Setting new size
v.setSize(4);
// Printing vector after calling setSize()
System.out.println("\nAfter using setSize()");
System.out.println("Vector: " + v);
System.out.println("Size: " + v.size());
}
}
**Output
Initially
Vector: [Geeks, for, Geeks, Computer, Science, Portal]
Size: 6
After using setSize()
Vector: [Geeks, for, Geeks, Computer]
Size: 4
```**
****例 3:** 当新尺寸为负时**
## **Java 语言(一种计算机语言，尤用于创建网站)**
```java
// Java program to Illustrate setSize() method
// of vector class
// Where size is negative
// Importing utility classes
import java.util.*;
// Main class
public class GFG {
// Main driver method
public static void main(String[] args)
{
// Creating Vector class object of string type
Vector<String> v = new Vector<String>();
// Inserting elements into the vector
// using add() method
v.add("Geeks");
v.add("for");
v.add("Geeks");
v.add("Computer");
v.add("Science");
v.add("Portal");
// Printing vector before calling setSize()
System.out.println("Initially");
System.out.println("Vector: " + v);
System.out.println("Size: " + v.size());
// Try block to check for exceptions
try {
// Setting new size
v.setSize(-8);
}
// Catch block to handle exceptions
catch (Exception e) {
// Display message when exceptions occured
System.out.println("Trying to change "
+ "size to '-8'\n" + e);
}
}
}
*输出:*
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