String inversion and String Inversion

String inversion and String Inversion

This is a question in a java interview question on the Internet:

The problem is: how to reverse a String.

String str = "1234567"; int length = str. length (); int beginIndex = length-1; char [] sourceCharArray = str. toCharArray (); char [] discCharArray = new char [length]; int j = 0; for (int I = beginIndex; I> = 0; I --) {discCharArray [j] = sourceCharArray [I]; j ++;} String newStr = String. valueOf (discCharArray );

The resulting operation is the operation of a character in a string. You can directly convert it to char [] first. Then, in the char operation on a pointer, reassemble it into a String through String. valueOf (char. Higher efficiency.