package Java_Fundamentals_Exercises;

public class Type_conversion {
    public static void main(String[] args) {
        short a = 1;
        short b = 2;
        //a + b的结果为int型
        System.out.println(a + b);//short byte char在进行计算时,会自动转换成int类型;
    }
}

<u>a

//强制类型转换
               short a = 1;
               short b = 2;
                System.out.println(a + b);
//short byte char在进行计算时,会自动转换成int类型;

//强制类型转换
               short a = 1;
               short b = 2;

public class LeiXingZhuangHuan {

	public static void main(String[] args) {
		// TODO 自动生成的方法存根
		short a=1;
		short b=2;
		System.out.println(getType(a+b));
	}
	 public static String getType(Object o) { 
	        return o.getClass().toString(); 
	    }
}

public class TypeOf {
    public static String getType(Object obj){
        return obj.getClass().toString();
    }
}
public class Main {
    public static void main(String[] args) {
        TypeOf d = new TypeOf();
        short a = 1;
        short b = 2;
        out.println(d.getType(a+b));
    }
}

运行结果：Integer

short a=1;
       short b=2;
       //是int  byte short char 运算会自动类型提升
        System.out.println(a+b);

//强制字符转换
	 short a = 1;
	 short b = 2;
	 short c =(byte)(a+b);
	 System.out.println(c);

<u>aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

public static void main(String[] args) {
        short a = 1;
        short b = 2;
//        因为a跟b都是int类型的数据，相加的过程当中会自动进行类型提升
        int c=a+b;
        System.out.println(c);
    }

public class Leixing {
     public static void main(String[] args) {
 
        short c = 1;
        short s = 2;

          int d=(c+s);
        System.out.println(d);
    }
}

输出int型

short a=1;
//        a=a+1;  类型不匹配，不能从int转换为short
     a= (short) (a+1);//第一种方法
        a+=1;//第二种方法

byte =c;
short a =1;
short b =2;
c =(byte)(a+b);
System.out.println(c);

public class Test3 {

    public static String getType(Object obj) {
        return obj.getClass().toString();
    }
        public static void main(String args[]){
        short a = 1;
        short b = 2;
        System.out.println(getType(a+b));
    }
}

为什么是44？因为byte是8位2进制最大是01111111或者11111111也就是±128，所以你100+200=300而超过了最大范围128溢出了。所以剩下的就是300-128-128=44