在项目中,变长参数使用相对比较少.以下便是变长参数的简单使用例子:
public class ParamTest {
public static void main(String[] args) {
ParamTest paramTest = new ParamTest();
paramTest.print("abc");
paramTest.print("not hello","hello", "李白");
System.out.println("==========================");
// 一个方法只能有一个可变长参数，并且这个可变长参数必须是该方法的最后一个参数
paramTest.print2("李白","a","b","c");
System.out.println("==========================");
ArrayList list = new ArrayList();
list.add(0);
list.add(1);
list.add(2);
paramTest.print3(list,"hello","李白");
System.out.println("==========================");
paramTest.print4(list,list,list);
}
public void print(String... args) {for (int i = 0; i < args.length; i++) {
System.out.println(args[i]);
}
}
public void print2(String name,String ... args){
System.out.println(name);
for (String arg : args) {
System.out.println(arg);
}
}
public void print3(List<Integer> list,String ... args){
System.out.println(list.size());
System.out.println(args[0]);
}
public void print4(ArrayList...list){
for (ArrayList arrayList : list) {
System.out.println(arrayList.get(0));
}
}
}
运行结果如下:
abc
not hello
hello
李白
==========================
李白
a
b
c
==========================
3
hello
==========================
0
0
0