Java基础知识（一）基本数据类型默认值

public class test_20190920 {
    public static void main(String[] args) {
        // 4种整数 2种浮点 1种字符 1种布尔
        // 类内部成员变量 静态变量可以不用初始化，局部变量必须初始化
        BaseType c = new BaseType();
        System.out.println(c.y);
        System.out.println(c.s);
        System.out.println(c.i);
        System.out.println(c.l);
        System.out.println(c.f);
        System.out.println(c.d);
        System.out.println(c.c);
        System.out.println(c.b);
        // 通过基本数据类型对应的包装器类，获取取值范围
        System.out.println(Byte.MIN_VALUE);
        System.out.println(Byte.MAX_VALUE);
        System.out.println(Short.MIN_VALUE);
        System.out.println(Short.MAX_VALUE);
        System.out.println(Integer.MIN_VALUE);
        System.out.println(Integer.MAX_VALUE);
        System.out.println(Long.MIN_VALUE);
        System.out.println(Long.MAX_VALUE);
        System.out.println(Float.MIN_VALUE);
        System.out.println(Float.MAX_VALUE);
        System.out.println(Double.MIN_VALUE);
        System.out.println(Double.MAX_VALUE);
        System.out.println((int) Character.MIN_VALUE);
        System.out.println((int) Character.MAX_VALUE);
    }
}

class BaseType {
    byte y;
    short s;
    int i;
    long l;
    float f;
    double d;
    char c;
    boolean b;
}