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我想編一個具有將二進制數更改爲小數的函數的代碼。有關在JAVA中輕鬆「返回」的問題
所以我做了衆長tonum()
,並試圖在Main方法返回。
但屏幕上顯示任何內容。哪裏有問題? Plz給了我一些提示。
public class Bitmap {
byte[] byteArr; //byte array for saving 0 or 1
char[] charArr; //char array for casting from string to byte array
public static void main(String[] args) throws Exception {
Bitmap test1 = new Bitmap("100110");
test1.tonum();
}
public Bitmap(String val) throws Exception {
byteArr = new byte[val.length()]; //To make the array length of Bitmap should e same as that of string
charArr = val.toCharArray(); //casting from string to char
for(int i = 0; i < charArr.length; i++) {
if (charArr[i] == '0')
byteArr[i] = 0;
else if (charArr[i] == '1')
byteArr[i] = 1;
else throw new Exception("Bitmap are should be sequences of zeros and ones!");
}
}
public long tonum() {
int temp = 0;
String str = "";
String str2 = "";
for (int i = 0; i < this.byteArr.length; i++){
temp = this.byteArr[i];
str = Integer.toString(temp);
str2 = str2 + str;
}
long decimal = (long)Integer.parseInt(str2,10);
System.out.println(str2);
return decimal;
}
}
這是什麼語言?請相應標記。 – geoffspear