拼接特殊字符的三种方式

java8字符串静态方法:

public static String List2StringContainSpecialSymbolJava8(String symbol,List<String> data){
    Objects.requireNonNull(symbol);
    Objects.requireNonNull(data);
    return String.join(symbol, data);
}

java8流的操作符:join

  //连接字符串
@Test
public void joining2(){
    List<Dish> dishes=new ArrayList<Dish>();
    dishes.add(new Dish(0,"sd",84.5));
    dishes.add(new Dish(1,"sd",10.5));
    dishes.add(new Dish(2,"sd",85.58));
    dishes.add(new Dish(3,"sd",8));
    dishes.add(new Dish(4,"sd",98.5));
    String shortMenu=dishes.stream().map(Dish::getDes).collect(Collectors.joining("+"));
    System.out.println(shortMenu);
}

低于java8:

public static String List2StringContainSpecialSymbol(String symbol,List<String> data){
    Objects.requireNonNull(symbol);
    Objects.requireNonNull(data);
    StringBuffer sb=new StringBuffer();
    for (String d:data){
        sb.append(d);
        sb.append(symbol);
    }
    return sb.toString().substring(0,sb.length()-1);
}