【笔记】Java8利用Lambda处理String[]转String

//记录一下相关的转换,以备后续学习

public static void main(String[] args){
   String[] a = stripAll("1","2","3","4");//org.apache.commons.lang3.StringUtils
   String[] b = stripAll(new String[]{
         
  "1","2","3","4"},"/");
   System.out.println(strip("/123/123 /","/"));
   System.out.println(Arrays.toString(a));

   String start = "";
   String end = "";
   String link = ",";
   int[] arr = {
         
  1,2,3,4};
   String[] arr2 = {
         
  "1","2","3","4"};
   //forEach函数实现内部迭代
   StringBuilder sb = new StringBuilder();
   Arrays.asList(arr2).forEach(o -> { if (sb.length() > 0) {
         
  sb.append(link);} sb.append(start + o + end);});//forEach函数实现内部迭代
   System.out.println(sb);
   //map collect
   String str1 = Arrays.stream(arr).boxed().map(i -> start+i.toString()+end).collect(Collectors.joining(link));
   String str1_1 = Arrays.stream(arr2).map(i -> start+i.toString()+end).collect(Collectors.joining(link));
   System.out.println("str1:"+str1);
   System.out.println("str1_1:"+str1_1);
   //map reduce
   String str2 = Arrays.stream(arr).boxed().map(i -> start+i.toString()+end).reduce("/", String::concat);
   System.out.println("str2:"+str2);
   // 方法引用Object：：toString
   String str3 = Arrays.stream(arr).boxed().map(Object :: toString).reduce("/", String::concat);
   System.out.println("str3:"+str3);

}

//记录一下相关的转换,以备后续学习 public static void main(String[] args){ String[] a = stripAll("1","2","3","4");//org.apache.commons.lang3.StringUtils String[] b = stripAll(new String[]{ "1","2","3","4"},"/"); System.out.println(strip("/123/123 /","/")); System.out.println(Arrays.toString(a)); String start = ""; String end = ""; String link = ","; int[] arr = { 1,2,3,4}; String[] arr2 = { "1","2","3","4"}; //forEach函数实现内部迭代 StringBuilder sb = new StringBuilder(); Arrays.asList(arr2).forEach(o -> { if (sb.length() > 0) { sb.append(link);} sb.append(start + o + end);});//forEach函数实现内部迭代 System.out.println(sb); //map collect String str1 = Arrays.stream(arr).boxed().map(i -> start+i.toString()+end).collect(Collectors.joining(link)); String str1_1 = Arrays.stream(arr2).map(i -> start+i.toString()+end).collect(Collectors.joining(link)); System.out.println("str1:"+str1); System.out.println("str1_1:"+str1_1); //map reduce String str2 = Arrays.stream(arr).boxed().map(i -> start+i.toString()+end).reduce("/", String::concat); System.out.println("str2:"+str2); // 方法引用Object：：toString String str3 = Arrays.stream(arr).boxed().map(Object :: toString).reduce("/", String::concat); System.out.println("str3:"+str3); }

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