1.使用谷歌的Joiner转换
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public static <T> String parseListToStr(List<T> list){
String result = Joiner.on( "," ).join(list);
return result;
}
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2.使用lambda表达式遍历集合
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public static <T> String parseListToStr2(List<T> list){
StringBuffer sb = new StringBuffer();
list.stream().forEach(str->{
sb.append(str).append( "," );
});
sb.deleteCharAt(sb.length()- 1 );
return sb.toString();
}
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3.直接使用stream流实现
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public static <T> String parseListToStr3(List<T> list){
String result = list.stream().map(String::valueOf).collect(Collectors.joining( "," ));
return result;
}
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4.使用for循环遍历集合
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public static <T> String parseListToStr(List<T> list){
StringBuffer sb = new StringBuffer();
if (listIsNotNull(list)) {
for ( int i= 0 ;i<=list.size()- 1 ;i++){
if (i<list.size()- 1 ){
sb.append(list.get(i) + "," );
} else {
sb.append(list.get(i));
}
}
}
return sb.toString();
}
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注意:在转换集合前应该都统一做判空处理
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原文链接:https://blog.csdn.net/londa/article/details/114807897