一、数组实现String反转
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//数组实现String反转 public String reverseByArray(){ if (str == null || str.length() == 1){ return null ; } char[] ch = str.toCharArray(); //字符串转换成字符数组 for (int i = 0 ; i < ch.length/2 ; i++){ char temp = ch[i]; ch[i] = ch[ch.length-i-1]; ch[ch.length-i-1] = temp; } return new String(ch); } |
二、栈实现String反转
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//用栈实现String反转 public String reverseByStack(){ if (str == null || str.length() == 1){ return null ; } Stack<Character> stack = new Stack<Character>(); char[] ch = str.toCharArray(); //字符串转换成字符数组 for (char c : ch) { stack.push(c); //每个字符,推进栈 } for (int i = 0; i < ch.length; i++) { ch[i] = stack.pop(); //移除这个堆栈的顶部对象 } return new String(ch); } |
三、逆序遍历实现String反转
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//用逆序遍历实现String反转 public String reverseBySort(){ if (str == null || str.length() == 1){ return null ; } StringBuffer sb = new StringBuffer(); for (int i = str.length() -1 ; i >= 0; i--) { sb.append(str.charAt(i)); //使用StringBuffer从右往左拼接字符 } return sb.toString(); } |
四、位运算实现String反转
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//使用位运算实现String反转 public String reverseByBit() { if (str == null || str.length() == 1){ return null ; } char[] ch = str.toCharArray(); //字符串转换成字符数组 int len = str.length(); for (int i= 0; i< len/ 2; i++) { ch[i]^= ch[len- 1- i]; ch[len- 1- i]^= ch[i]; ch[i]^= ch[len- 1- i]; } return new String(ch); } |
五、递归实现String反转
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//使用递归实现String反转 public String reverseByRecursive(String str){ if (str == null || str.length() == 0 ){ return null ; } if (str.length() == 1 ){ return str; } else { //从下标为1开始截取字符串,在返回下标为0的字符 return reverseByRecursive(str.substring( 1 )) + str.charAt( 0 ); } } |
六、测试
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public class Test { public static void main(String[] args) { String s = "123456" ; Reverse r = new Reverse(s); System.out.println(r.reverseByArray()); System.out.println(r.reverseByStack()); System.out.println(r.reverseBySort()); System.out.println(r.reverseByBit()); System.out.println(r.reverseByRecursive(s)); } } |
七、结果
八、用于String反转的全部代码
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public class Reverse { private String str = null ; public Reverse(String str){ this .str = str; } //数组实现String反转 public String reverseByArray(){ if (str == null || str.length() == 1 ){ return null ; } char [] ch = str.toCharArray(); //字符串转换成字符数组 for ( int i = 0 ; i < ch.length/ 2 ; i++){ char temp = ch[i]; ch[i] = ch[ch.length-i- 1 ]; ch[ch.length-i- 1 ] = temp; } return new String(ch); } //用栈实现String反转 public String reverseByStack(){ if (str == null || str.length() == 1 ){ return null ; } Stack<Character> stack = new Stack<Character>(); char [] ch = str.toCharArray(); //字符串转换成字符数组 for ( char c : ch) { stack.push(c); //每个字符,推进栈 } for ( int i = 0 ; i < ch.length; i++) { ch[i] = stack.pop(); //移除这个堆栈的顶部对象 } return new String(ch); } //用逆序遍历实现String反转 public String reverseBySort(){ if (str == null || str.length() == 1 ){ return null ; } StringBuffer sb = new StringBuffer(); for ( int i = str.length() - 1 ; i >= 0 ; i--) { sb.append(str.charAt(i)); //使用StringBuffer从右往左拼接字符 } return sb.toString(); } //使用位运算实现String反转 public String reverseByBit() { if (str == null || str.length() == 1 ){ return null ; } char [] ch = str.toCharArray(); //字符串转换成字符数组 int len = str.length(); for ( int i= 0 ; i< len/ 2 ; i++) { ch[i]^= ch[len- 1 - i]; ch[len- 1 - i]^= ch[i]; ch[i]^= ch[len- 1 - i]; } return new String(ch); } //使用递归实现String反转 public String reverseByRecursive(String str){ if (str == null || str.length() == 0 ){ return null ; } if (str.length() == 1 ){ return str; } else { //从下标为1开始截取字符串,在返回下标为0的字符 return reverseByRecursive(str.substring( 1 )) + str.charAt( 0 ); } } } |
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