0
這是一個簡單的數字猜測的例子來演示Java EE 7中的依賴注入。我不太明白的是Game.java中的兩個注入字段，「maxNumber」和「randomNumber」。我知道它們可以被注入，因爲在Generator.java中有兩個@produce方法，@Produce int next（）和@Produce int getMaxNumber（）。在這個例子中通過@Produce註釋的依賴注入
但是，方法名稱「next（）」與Game.java中注入的「randumNumber」不匹配。這是如何工作的？
此外，我試着在Generator.java中將「getMaxNumber（）」更改爲其他「getMMMaxNumber（）」。該程序仍然正常工作。所以，我真的不明白這兩個字段是如何從Generator.java注入Game.java的。
請幫忙理解這一點。非常感謝。
Game.java
package org.jboss.as.quickstarts.numberguess;
@SuppressWarnings("serial")
@Named
@SessionScoped
public class Game implements Serializable {
/**
* The number that the user needs to guess
*/
private int number;
/**
* The users latest guess
*/
private int guess;
/**
* The smallest number guessed so far (so we can track the valid guess range).
*/
private int smallest;
/**
* The largest number guessed so far
*/
private int biggest;
/**
* The number of guesses remaining
*/
private int remainingGuesses;
/**
* The maximum number we should ask them to guess
*/
@Inject
@MaxNumber
private int maxNumber;
/**
* The random number to guess
*/
@Inject
@Random
Instance<Integer> randomNumber;
public Game() {
}
public int getNumber() {
return number;
}
public int getGuess() {
return guess;
}
public void setGuess(int guess) {
this.guess = guess;
}
public int getSmallest() {
return smallest;
}
public int getBiggest() {
return biggest;
}
public int getRemainingGuesses() {
return remainingGuesses;
}
@PostConstruct
public void reset() {
this.smallest = 0;
this.guess = 0;
this.remainingGuesses = 10;
this.biggest = maxNumber;
this.number = randomNumber.get();
}
}
Generator.java
@SuppressWarnings("serial")
@ApplicationScoped
public class Generator implements Serializable {
private java.util.Random random = new java.util.Random(System.currentTimeMillis());
private int maxNumber = 100;
java.util.Random getRandom() {
return random;
}
@Produces
@Random
int next() {
// a number between 1 and 100
return getRandom().nextInt(maxNumber - 1) + 1;
}
@Produces
@MaxNumber
int getMaxNumber() {
return maxNumber;
}
}
MaxNumber.java
@Target({ TYPE, METHOD, PARAMETER, FIELD })
@Retention(RUNTIME)
@Documented
@Qualifier
public @interface MaxNumber {
}
Random.java
@Target({ TYPE, METHOD, PARAMETER, FIELD })
@Retention(RUNTIME)
@Documented
@Qualifier
public @interface Random {
}