package GenericProgramma;
import java.net.StandardSocketOptions;
import java.util.ArrayList;
import java.util.Collections;
import java.util.*;
class IteratorTest
{
public static void main(String args[])
{
List<String> tableList = new ArrayList<>();
tableList.add("西游記");
tableList.add("水滸傳");
List<String> bookList = new ArrayList<>();
bookList.add("三國演義");
bookList.add("莎士比亞");
bookList.add("紅樓夢");
bookList.add(0,tableList.get(1));
bookList.set(2,tableList.get(0));
System.out.println(String.join("、",bookList));
}
}
bookList.add(0,tableList.get(1));
bookList.set(2,tableList.get(0));
System.out.println(String.join("、",bookList)); 就是這幾句的含義
uj5u.com熱心網友回復：
要學會自己查 java 的api
join
public static String join(CharSequence delimiter,
Iterable<? extends CharSequence> elements)
Returns a new String composed of copies of the CharSequence elements joined together with a copy of the specified delimiter.
For example,
List<String> strings = new LinkedList<>();
strings.add("Java");strings.add("is");
strings.add("cool");
String message = String.join(" ", strings);
//message returned is: "Java is cool"
Set<String> strings = new LinkedHashSet<>();
strings.add("Java"); strings.add("is");
strings.add("very"); strings.add("cool");
String message = String.join("-", strings);
//message returned is: "Java-is-very-cool"
uj5u.com熱心網友回復：
第一句，將tableList的第二個元素插入到到bookList的第一個第二句，將bookList的第三個元素替換為tableList的第一個元素
第三句就是列印bookList的元素
uj5u.com熱心網友回復：
好的謝謝
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