问题描述
如题,怎么删除list的中括号例如['a','b','c','d'] 变成 'a','b','c','d'
解决方案
import java.util.ArrayList;import java.util.List;import java.util.regex.Pattern;public class Test {public static void main(String[] args) {List<String> list = new ArrayList<String>();list.add("a");list.add("b");list.add("c");String s = Pattern.compile("\b([\w\W])\b").matcher(list.toString().substring(1,list.toString().length()-1)).replaceAll("'$1'");System.out.println(s);}}
解决方案二：
重写java.util.AbstractCollection.java下面的toString方法。 /** * Returns a string representation of this collection. The string * representation consists of a list of the collection's elements in the * order they are returned by its iterator, enclosed in square brackets * (<tt>"[]"</tt>). Adjacent elements are separated by the characters * <tt>", "</tt> (comma and space). Elements are converted to strings as * by {@link String#valueOf(Object)}. * * @return a string representation of this collection */ public String toString() { Iterator<E> it = iterator(); if (! it.hasNext()) return "[]"; StringBuilder sb = new StringBuilder(); sb.append('['); for (;;) { E e = it.next(); sb.append(e == this ? "(this Collection)" : e); if (! it.hasNext()) return sb.append(']').toString(); sb.append(',').append(' '); } }
解决方案三：
org.apache.commons.lang.StringUtilsStringUtils.strip( "['a','b','c','d']", "[]");一行搞定
解决方案四：
System.out.println(list.toString().replaceAll("\[|\]", ""));
解决方案五：
或者import java.util.ArrayList;import java.util.List;public class Test {public static void main(String[] args) {List<String> a = new ArrayList<String>(); a.add("a"); a.add("b"); System.out.println(a); List<String> b = new ArrayList<String>(); for (String string : a) { b.add("'"+string+"'"); } System.out.println(b.toString().substring(1, b.toString().length()-1));}}