int变成string，string变成chararray，chararray倒序遍历变回string string变回int 记得判断正负。也可以用/10的余数取数字然后再乘10加回来 例如：public String reverseSting(String inputString) { char[] inputStringArray = inputString.toCharArray();String reverseString = "";for (int i = inputS...
public class ReverseNum { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int num = sc.nextInt(); // System.out.println(reverse0(num)); System.out.println(reverse1(num)); System.out.println(reverse2(num)); System.out.println(reverse3(num)); } publi...
Reverse digits of an integer. Example1:x = 123, return 321 Example2:x = -123, return -321 1publicclassSolution {2publicintreverse(intx) {3String str=x+"";4booleanisNeg=false;5if(str.charAt(0)=='-')6{7str=str.substring(1);8isNeg=true;9}1011//System.out.println(str);12chart...
System.out.println("返回 double 类型的值:" + num.doubleValue()); System.out.println("返回 int 类型的值:" + num.intValue()); System.out.println("返回 float 类型的值:" + num.floatValue()); 1. 2. 3. 4. 执行上述代码,输出结果如下: 返回double 类型的值:12.5 返回int 类型的值:12 ...
publicintreverse(intx) { finalString LowerValue ="2147483648"; finalString UpperValue ="2147483647"; finalintmaxlength =10; String sOriginal = String.valueOf(x); String sReverse = stringReverse(sOriginal); String sfinal =newString();
publicbooleanequals(Object anObject){if(this==anObject){returntrue;}if(anObjectinstanceofString){String anotherString=(String)anObject;int n=value.length;if(n==anotherString.value.length){char v1[]=value;char v2[]=anotherString.value;int i=0;while(n--!=0){if(v1[i]!=v2[i])returnfa...
Integer.Reverse(Int32) Method ทําการทดสอบ 21 พฤษภาคม – 21 มิถุนายน 2024 ลงทะเบียนตอนนี้ ปิดการแจ้งเตือน...
int是基本数据类型,Integer是int的封装类, 是引用类型。int默认值是0,而Integer默认值是null,所以Integer能区分出0和nulI的情况。一旦java看到nul,就知道这个引用还没有指向某个对象,再任何弓|用使用前,必须为其指定一个对象, 否则会报错。 基本数据类型在声明时系统会自动给它分配空间,而引用类型声明时只是分配了...
int[] array = {1, 2, 3}; Collections.reverse(Arrays.asList(array)); //Does not reverses the array 2. Swapping Array Elements in For Loop Another simple and straightforward way is to iterate through the array swapping them from the beginning position with the elements in the last position...
int reverse( int value){ int res = 0; while (value){ res = res * 10 + value % 10; value /= 10; } return res; } int ismirror( int value ) { if(value == reverse(value)){ return 1; }else{ return 0; } } 2.有一个链表,反转链表中第m到第n个元素。1 <=m <=n <= 链...