- Arraylist里面存储默认是Object的,不能直接赋值给String类型的变量,需要强转。
- 值传递和引用传递
class Test {
String str = new String("hello");
char[] ch = {'a', 'b', 'c'};
public static void main(String[] args) {
//System.out.println(Math.pow('a',2));//9409
Test test = new Test();
test.change(test.str, test.ch);
System.out.println(test.str + " and");
System.out.println(test.ch);
}
public void change(String str, char[] ch) {
str = "test ok";
ch[0] = '啦';
//char[] chars = {'a'};
//ch = chars;
}
}
Original: https://www.cnblogs.com/recorderM/p/16065362.html
Author: 紫英626
Title: 笔试小总结
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