回答編集履歴
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コード例を追記しました。
test
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@@ -21,3 +21,117 @@
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の状態になります。
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---
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（追記）
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上で説明しているコードを実際に書くとこんな感じです。
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```lang-java
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public final class App {
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public static void main(String[] args) {
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Counter counter = new Counter();
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CountDownThread t1 = new CountDownThread("thread 1", counter);
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CountDownThread t2 = new CountDownThread("thread 2", counter);
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t1.start();
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t2.start();
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}
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}
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class Counter {
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private int count;
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void increment() {
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++count;
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}
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int getCount() {
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return count;
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}
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}
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class CountDownThread extends Thread {
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private String name;
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private Counter counter;
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public CountDownThread(String name, Counter counter) {
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this.name = name;
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this.counter = counter;
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}
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public void run() {
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for (int i = 3; i >= 0; i--) {
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try {
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counter.increment();
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sleep(1000);
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} catch (InterruptedException e) {
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}
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System.out.println(name + " : " + i);
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}
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}
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}
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```
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