Conversion of arrays and strings

Conversion of arrays and strings

Looks like the array needs to be a string to fit into the database

So

First, the conversion of arrays and strings in JS

Array variable string var a, B; Two variables an array a a string b

A=new array{0,1,2,3,4,5};

B=a.join ("-"); b= "0-1-2-3-4-5" js inside the array into a string with the array name. Join ("-");

String variable group var b= "0-1-2-3-4-5";

var a=b.split ("-"); In-decomposition js inside the string variable group uses a string. Split ("-");

Second, the use of the list array in Java code

1 Converting a list collection to a list array

List<a> Alist=aservice.getbyid (IDs);//from the database according to the ID of a collection put to the list collection, A is an entity

List<string> blist=new arraylist<string> (); Create a list array to put a number

For (a a1:alist) {

Blist.add (A1.getano ());                            Places the number of a in the list collection into List array B. list's. Add Usage

}

2 Converting a list array into a string array

String [] a=new string[blist.size ()]; Creates an array of type string generic collection. Size array. length string. Length ()

Blist.toarray (a);//Convert list array to list array of string array--"string ToArray for Arrays

3 putting a string string into a string array

String s1= "AAAAA";

String s2= "BBBBB";

String s3= "CCCCC";

Arraylist<string> slist=new arraylist<string> (); List array

Slist.add (S1);

Slist.add (S2);

Slist.add (S3);

String [] str=new string[slist.size ()];

Slist.toarray (str);

4 array-"string introduced into the Apache Commons component of the Commons-lang.jar package in the Apache Commons component of the Commons-lang.jar package

String [] a={"abc", "D", "EF"};

String Str=stringutils.join (A, "-");                                                                                 Stringutils.join next detail

5 Array--"string String.Format () method String.Format () method The next article detailed

String Str=string.format ("%s,%s,%s", a);

6 array-"string traversal stitching StringBuffer stringbuffer inside the Append Method next detail to get

StringBuffer sb=new StringBuffer ();

for (in i=0;i<a.length;i++) {

Sb.append (A[i]);

}

String strn=sb.tostring ();

　　　　　　

　　　　　　　　　　　　

Conversion of arrays and strings