這單元定義的student是student（String id,String name）,而為什么老師在添加學生類過程中確是studentlist.add(new student(1+""+"小明")，為什么多添加了一個整型的參數卻沒有報錯呢？
我認為正確的傳參方式：
public void testStudentsort()
{
List<student>studentlist= new ArrayList<student>();
studentlist.add(new student("1","小明"));
studentlist.add(new student("2","小紅"));
studentlist.add(new student("3","小綠"));
for (student student : studentlist) {
System.out.println("學生"+student.name);
}
}
老師添加學生類的代碼
public void testStudentsort()
{
List<student>studentlist= new ArrayList<student>();
studentlist.add(new student(1+"","小明"));
studentlist.add(new student(2+"","小紅"));
studentlist.add(new student(3+"","小綠"));
for (student student : studentlist) {
System.out.println("學生"+student.name);
}
}
2017-11-05
studentlist.add(new student(1+"","小明"); ?
?(1+"")這就是一個字符串啊，數字+""就轉成字符串了，等同于"1"。
2018-12-16
int轉String? :
int i =1;
String is =i+"";
int i =1;
String is =i.valueOf(i);
2017-11-05
int + String 等于 String