Ich versuche, meinen Code zu testen, aber die letzte System.out.printl antwortet nicht, warum?Fix Test mit Methode gleich() und überschreiben diese und hashCode()
@Test
public void testcopy(){
RomanNumber rn1 = new RomanNumber("M");
RomanNumber rn2 = new RomanNumber("M");
RomanNumber rn1_copy = rn1;
System.out.println("rn1 == rn1_copy is "
+ (rn1 == rn1_copy));
System.out.println("rn1 == rn2 is " + (rn1 == rn2));
System.out.println("rn1.equals(rn2) is " + (rn1.equals(rn2)));
}
Wieder ich die equals()
Methode der Superklasse Object
außer Kraft setzen wollen, habe ich versucht, dies:
public boolean equals(Object obj) {
if ((obj instanceof RomanNumber)) {
RomanNumber decimal = (RomanNumber) obj;
if (number == decimal.convertToInteger() && number.equals(decimal.convertToInteger)) {
return true;
} else {
return false;
}
} else {
return false;
}
}
Schließlich habe ich unter all den Code veröffentlichen, die es macht:
public class RomanNumber {
private String number;
public RomanNumber (String number){
this.number = number;
}
/**
* @return integer equivalent of this roman number
*/
public int convertToInteger() {
int decimal = 0;
int lastNumber = 0;
// take the string roman number
// write algorithm to convert it to int
// return int
number = number.toUpperCase();
for (int x = number.length() - 1; x >= 0; x--) {
char convertNumber = number.charAt(x);
switch (convertNumber) {
case 'M':
decimal = processDecimal(1000, lastNumber, decimal);
lastNumber = 1000;
break;
case 'D':
decimal = processDecimal(500, lastNumber, decimal);
lastNumber = 500;
break;
case 'C':
decimal = processDecimal(100, lastNumber, decimal);
lastNumber = 100;
break;
case 'L':
decimal = processDecimal(50, lastNumber, decimal);
lastNumber = 50;
break;
case 'X':
decimal = processDecimal(10, lastNumber, decimal);
lastNumber = 10;
break;
case 'V':
decimal = processDecimal(5, lastNumber, decimal);
lastNumber = 5;
break;
case 'I':
decimal = processDecimal(1, lastNumber, decimal);
lastNumber = 1;
break;
}
}
System.out.println(decimal);
return decimal;
}
private static int processDecimal(int decimal, int lastNumber, int lastDecimal) {
if (lastNumber > decimal) {
return lastDecimal - decimal;
} else {
return lastDecimal + decimal;
}
}
private void validateState(String number){
if (number == null)
throw new IllegalArgumentException("Null argument");
if (number.isEmpty())
throw new IllegalArgumentException("Empty string");
if (!number.matches("^M{0,4}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})$"))
throw new IllegalArgumentException("Invalid Roman number");
}
public boolean equals(Object obj) {
if ((obj instanceof RomanNumber)) {
RomanNumber decimal = (RomanNumber) obj;
if (number == decimal.convertToInteger() && number.equals(decimal.convertToInteger)) {
return true;
} else {
return false;
}
} else {
return false;
}
}
}
Danke.
Fix was? Was ist kaputt? – bradimus
Was soll "letzte System.out.printl antwortet nicht" bedeuten? – khelwood
Sie haben die Klammern der 'convertToInteger' -Funktion am Ende dieser Zeile vergessen:' if (Zahl == Dezimal.convertToInteger() && Zahl.equals (Dezimal.convertToInteger)) ' – zockDoc