使用开关案例将字母(A-F和任何其他人应该说错误)转换为二进制文件 这是主要的:
Scanner keyboard = new Scanner(System.in);
System.out.println("Enter a letter :: ");
String letter = keyboard.next();
keyboard.getBinary();
keyboard.toString();
和班级:
import static java.lang.System.*;
public class HexToBinary
{
private char hex;
public HexToBinary()
{
hex=0;
}
public HexToBinary(char hexNum)
{
hex=hexNum;
}
public void setHex(char hexNum)
{
hex=hexNum;
}
public String getBinary()
{
String letter = letter;
switch(letter)
{
case A: letter = 1010;
case B: letter = 1011;
case C: letter = 1100;
case D: letter = 1101;
case E: letter = 1110;
case F: letter = 1111;
case default: letter = ERROR;
}
return "";
}
public String toString()
{
System.out.println(letter+" is " getBinary + "in binary!")
return "";
}
错误表示在“keyboard.getBinary();”期间找不到符号 不确定是什么问题
答案 0 :(得分:2)
错误表示在“keyboard.getBinary();”期间找不到符号不确定是什么问题
扫描程序没有getBinary()
方法,因为API会告诉您:Scanner API。
更重要的是
但你的HexToBinary类确实有这种方法。您将需要创建一个HexToBinary变量,为其分配一个HexToBinary对象,然后在此变量上调用此方法。
所以不是:
Scanner keyboard = new Scanner(System.in);
System.out.println("Enter a letter :: ");
String letter = keyboard.next();
keyboard.getBinary();
keyboard.toString();
而是:
Scanner keyboard = new Scanner(System.in);
System.out.println("Enter a letter :: ");
String letter = keyboard.next();
// check that letter has only one char in it.
// convert your letter to a char.
// create a HexToBinary variable and object here
// use its methods to convert the char to binary.