Explanation of Terms
In-Place Algorithm(原地算法): an in-place algorithm is an algorithm which transforms input using no auxiliary data structure. However a small amount of extra storage space is allowed for auxiliary variables. The input is usually overwritten by the output as the algorithm executes. In-place algorithm updates input sequence only through replacement or swapping of elements. (Wikipedia)
Basic Knowledge Character Classhttps://www.tutorialspoint.co...
https://docs.oracle.com/javas...
Integer to StringConvert using Integer.toString(int)
Convert using String.valueOf(int)
To Declare an ArrayList with ValuesFor example
ListIterate through a HashMaptemp = new ArrayList (Arrays.asList("1", "12"));
https://stackoverflow.com/que...
If you"re only interested in the keys, you can iterate through the keySet() of the map:
Map
If you only need the values, use values():
for (Object value : map.values()) { // ... }
Finally, if you want both the key and value, use entrySet():
for (Map.EntryCoding Test i++ & ++i 賦值
public class test { public static void main(String[] args) { int i1=0, i2=0, i3=0, i4=0, index1=0, index2=0, index3=0, index4=0; int[] num1 = new int[10]; int[] num2 = new int[10]; int[] num3 = new int[10]; int[] num4 = new int[10]; while (index1 < 5 && index2 < 5 && index3 < 5 && index4 < 5) { num1[index1++] = i1++; //01234 num2[++index2] = i2++; //001234 num3[index3++] = ++i3; //12345 num4[++index4] = ++i4; //012345 } for (int n : num1) { System.out.print(n); } System.out.println(); for (int n : num2) { System.out.print(n); } System.out.println(); for (int n : num3) { System.out.print(n); } System.out.println(); for (int n : num4) { System.out.print(n); } } } /* Output * 0123400000 * 0012340000 * 1234500000 * 0123450000 */要寫的
StringBuilder & StringBuffer
Stack & Queue
Hash Table & HashMap & HashSet
Iterator
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