自动类型转换

public class Demo11 {
    public static void main(String[] args) {
        byte b1 = 2;
        int i1 = 129;
        //编译不通过
        //byte b2 = b1 + i1;
        int i2 = b1 + i1;
        long l2 = b1 + i1;
        System.out.println(i2);
        System.out.println(l2);

        float f = b1 + i1;
        System.out.println(f);

        short s1 = 123;
        double d1 = s1;
        System.out.println(d1);//123.0

        //=====================特别的==============================
        char c1 = 'a';//97
        int i3 = 10;
        int i4 = c1 + i3;
        System.out.println(i4);

        short s2 = 10;
        //char c2 = c1 + s2;//编译不通过

        byte b2 = 10;
        //char c3 = c1 + b2;//编译不通过

        //short s3 = b2 + s2;//编译不通过

        //short s4 = b1 + b2;//编译不通过
        //=========================================================


    }
}