7.10 字符串与字节

public class HelloWorld {
    public static void main(String args[]){// String args[]字符串数组的意思

        String str = "helloworld";
        byte data[] = str.getBytes();//将字符串变成字节数组
        for(int x = 0;x < data.length;x++){
            data[x] -= 32;
        }
        System.out.println(data);
        System.out.println(new String(data));
        System.out.println(new String(data,0,5));
    }

}