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String s1 = "100";
Integer.parseInt(s1);
Double.parseDouble(s1);
## 2. 浮点数转换为字符串
int i = 10;
String s = Double.toString(i);
String s2 = Double.toString(i);
Java数组是引用数组,所有的数组的元素都是一个指向真实的数组单元类型的一个引用。而C语言中数组元素就是真正数组元素类型的结构。
一旦Java的数组内存申请后,数组的大小就是不可变化的。
比如:
String[] strArray = new String[100];
这里Java初始化了长度为100的一个String类型的数组,之后数组的长度将不再可以变更。这一点和C中的数组是一样的,要想改变数组的长度,只能通过重新malloc内存让数组变量指向新分配的内存。
先调用父类的非静态初始化块,调用父类的某一个构造函数,然后调用子类的非静态初始化块和某个构造函数,以上步骤递归执行。
因此super和this只能出现其中之一。并且只能出现一次。
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