Java 数据类型转换

import javax.swing.plaf.synth.SynthStyle;

public class DataTypeChange {

    public static void main(String[] args) {
        // byte 转 int
        byte number1=25;
        int number2;
        number2=number1;
        System.out.println("number2:"+number2);

        //int 转 byte
        number2 = 88;
        number1=(byte)number2;
        System.out.println("number2"+number2);

        //short 转 byte
        //强制转换
        short number3=99;
        byte number6=22;
        number6 = (byte)number3;
        System.out.println("number6:"+number6);

        //浮点型转换整数型
        double dnumber=25.7;
        int number5=(int) dnumber;
        System.out.println("number5:"+number5);
        dnumber = number5;
        System.out.println("dumber"+dnumber);

        //常量final
        final int number8=56;
        //number8=66;报错  常量不允许重新赋值ֵ
        double PI=Math.PI;
        System.out.println("π"+PI);

    }

}