java语法基础-函数的结束--return
public static int show(boolean b){
if(b)
return 11;
else
return 0;
}
---主函数也是有return的
public static void show2Int(int age){
if(age<0)
System.out.println("数值是非法的");return;
System.out.println(x);
}
---------------------
数组
数组的定义：同一种类型数据的集合，就是容器，
特点：
1.这些数据必须是同一类型
2.存储时必须明确元素的个数
---------------
***java的内存划分
1.寄存器：cpu涉及的区域
3.栈内存：存储的都是局部变量，变量运算区域，一结束就释放，
局部变量：在方法上的参数，方法内的变量，语句上的变量
4.堆内存： 存储的是数组和对象，简单说，堆内存中存储都是实体
实体就是可以存储多个数据的地方，记住，只要是用new建立都存储在堆内存中
特点：
1.任何实体都有内存地址值
2.堆内存中的变量都有默认初始化值
5.方法区：存储共享数据的东西
内存图解
对象初始化过程图解
< http://www.2cto.com/kf/ware/vc/" target="_blank" class="keylink">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"cons code run");
try();
}
Person(){//对对应的对象进行初始化
......
}
public void cry(){
sop("哇哇");
}
}
this内存图
------------
static 关键宗 http://www.2cto.com/kf/yidong/wp/" target="_blank" class="keylink">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