Java 中的 StringBuilder deleteCharAt()示例
原文:https://www . geeksforgeeks . org/stringbuilder-delete charat-in-Java-with-examples/
字符串生成器类的 deleteCharAt(int index) 方法从字符串生成器包含的字符串中删除给定索引处的字符。该方法将索引作为一个参数，该参数代表我们要移除的字符的索引，并将剩余的字符串作为 StringBuilder 对象返回。应用此方法后，该字符串生成器缩短了一个字符。
语法:
public StringBuilder deleteCharAt(int index)
参数:这个方法接受一个参数索引代表你想要删除的字符的索引。
返回值:该方法在移除字符后返回这个 StringBuilder 对象。
异常:如果索引小于零，或者索引大于字符串的长度，则该方法抛出StringIndexOutOfBoundsException。
下面的程序演示了 StringBuilder 类的 deleteCharAt()方法:
例 1:
// Java program to demonstrate
// the deleteCharAt() Method.
class GFG {
public static void main(String[] args)
{
// create a StringBuilder object
// with a String pass as parameter
StringBuilder
str
= new StringBuilder("WelcomeGeeks");
// print string
System.out.println("Before removal String = "
+ str.toString());
// remove the Character from index 8
StringBuilder afterRemoval = str.deleteCharAt(8);
// print string after removal of Character
System.out.println("After removal of character"
+ " at index 8 = "
+ afterRemoval.toString());
}
}
Output:
Before removal String = WelcomeGeeks
After removal of character at index 8 = WelcomeGeks
例 2:
// Java program to demonstrate
// the deleteCharAt() Method.
class GFG {
public static void main(String[] args)
{
// create a StringBuilder object
// with a String pass as parameter
StringBuilder
str
= new StringBuilder("GeeksforGeeks");
// print string
System.out.println("Before removal String = "
+ str.toString());
// remove the Character from index 3
str = str.deleteCharAt(3);
// print string after removal of Character
System.out.println("After removal of Character"
+ " from index=3"
+ " String becomes => "
+ str.toString());
// remove the substring from index 5
str = str.deleteCharAt(5);
// print string after removal of Character
System.out.println("After removal of Character"
+ " from index=5"
+ " String becomes => "
+ str.toString());
}
}
Output:
Before removal String = GeeksforGeeks
After removal of Character from index=3 String becomes => GeesforGeeks
After removal of Character from index=5 String becomes => GeesfrGeeks
示例 3: 演示 IndexOutOfBoundException
// Java program to demonstrate
// exception thrown by the deleteCharAt() Method.
class GFG {
public static void main(String[] args)
{
// create a StringBuilder object
// with a String pass as parameter
StringBuilder
str
= new StringBuilder("evil dead_01");
try {
// make index > length of String
StringBuilder
afterRemoval
= str.deleteCharAt(14);
}
catch (Exception e) {
System.out.println("Exception: " + e);
}
}
}
Output:
Exception: java.lang.StringIndexOutOfBoundsException: String index out of range: 14
参考: https://docs . Oracle . com/javase/10/docs/API/Java/lang/stringbuilder . html # delete charat(int)
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