Java 中 StringBuilder trimToSize()方法，带示例
原文:https://www . geeksforgeeks . org/stringbuilder-trimtosize-method-in-Java-with-examples/
StringBuilder 类的 trimToSize() 方法是用于修剪 StringBuilder 对象的字符序列的容量的内置方法。如果 StringBuilder 对象使用的缓冲区大于保存其当前字符序列所需的大小，则调用此方法来调整 StringBuilder 对象的大小，以便将此对象转换为更节省空间的对象。调用此方法可能会影响后续调用 capacity()方法返回的值，但这不是必需的。
语法:
public void trimToSize()
返回:此方法不返回任何内容。
下面的程序说明了 StringBuilder.trimToSize()方法:
例 1:
// Java program to demonstrate
// the trimToSize() Method.
class GFG {
public static void main(String[] args)
{
// create a StringBuilder object
// with a String pass as parameter
StringBuilder str
= new StringBuilder("GeeksForGeeks");
// add more string to StringBuilder
str.append("Contribute");
// print capacity
System.out.println("Capacity before "
+ "applying trimToSize() = "
+ str.capacity());
// applying trimToSize() Method
str.trimToSize();
// print string
System.out.println("String = " + str.toString());
// print capacity
System.out.println("Capacity after"
+ " applying trimToSize() = "
+ str.capacity());
}
}
Output:
Capacity before applying trimToSize() = 29
String = GeeksForGeeksContribute
Capacity after applying trimToSize() = 23
例 2:
// Java program to demonstrate
// the trimToSize() Method.
class GFG {
public static void main(String[] args)
{
// create a StringBuilder object
// with a String pass as parameter
StringBuilder str
= new StringBuilder();
// add more string to StringBuilder
str.append("GeeksForGeeks classes");
// print capacity
System.out.println("Capacity before"
+ " applying trimToSize() = "
+ str.capacity());
// applying trimToSize() Method
str.trimToSize();
// print string
System.out.println("String = " + str.toString());
// print capacity
System.out.println("Capacity after "
+ "applying trimToSize() = "
+ str.capacity());
}
}
Output:
Capacity before applying trimToSize() = 34
String = GeeksForGeeks classes
Capacity after applying trimToSize() = 21
参考文献: https://docs . Oracle . com/javase/10/docs/API/Java/lang/stringbuilder . html # trimToSize()
版权属于：月萌API www.moonapi.com，转载请注明出处
