java如何使字符串反转

Java中可以使用StringBuilder类或者CharArray来实现字符串反转。

1. 使用StringBuilder类：

String str = "Hello World";
StringBuilder sb = new StringBuilder(str);
String reverseStr = sb.reverse().toString();
System.out.println(reverseStr);

2. 使用CharArray：

String str = "Hello World";
char[] charArray = str.toCharArray();
int length = charArray.length;
for (int i = 0; i < length / 2; i++) {
    char temp = charArray[i];
    charArray[i] = charArray[length - 1 - i];
    charArray[length - 1 - i] = temp;
}
String reverseStr = new String(charArray);
System.out.println(reverseStr);