Java List转换为字符串的几种方法
import org.apache.commons.lang3.StringUtils;
import java.util.ArrayList;
import java.util.List;
// 参考：https://blog.csdn.net/vasilis_1/article/details/75499087
public class ListToStringTest {
public static String listToString1(List list, char separator) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < list.size(); i++) {
sb.append(list.get(i)).append(separator);
}
return list.isEmpty() ? “” : sb.toString().substring(0, sb.toString().length() – 1);
}
public static String listToString2(List list, char separator) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < list.size(); i++) {
if (i == list.size() – 1) {
sb.append(list.get(i));
} else {
sb.append(list.get(i));
sb.append(separator);
}
}
return sb.toString();
}
public static String listToString3(List list, char separator) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < list.size(); i++) {
sb.append(list.get(i));
if (i < list.size() – 1) {
sb.append(separator);
}
}
return sb.toString();
}
// 总结：方法五在实际应用中最多，因为它已经被封装好了，速度也很快
public static String listToString4(List list, char separator) {
return StringUtils.join(list.toArray(), separator);
}
public static void main(String[] args) {
List list = new ArrayList();
list.add(“a”);
list.add(“b”);
list.add(“c”);
list.add(“d”);
System.out.println(ListToStringTest.listToString1(list, ‘+’));
System.out.println(ListToStringTest.listToString2(list, ‘-‘));
System.out.println(ListToStringTest.listToString3(list, ‘*’));
System.out.println(ListToStringTest.listToString4(list, ‘/’));
}
}
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