回答編集履歴
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リソースのクローズ
test
CHANGED
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@@ -1 +1,49 @@
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FileWriterのコンストラクタで，第2引数にtrueを指定すると「追記モード」になり，存在するファイルに追記できます．
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質問とは関係ないですが，br,bwなどのリソースはfinallyブロックでcloseするか，Java7以降ならtry-with-resources文を使う事をおすすめします．
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```java
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BufferedReader br = null;
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BufferedWriter bw = null;
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try{
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br = new BufferedReader(new FileReader("log.txt"));
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bw = new BufferedWriter(new FileWriter("log.txt"));
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//略
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} catch (IOException e){
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} finally {
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try{
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if(br != null) br.close();
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} catch (IOException e){}
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try{
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if(bw != null) bw.close();
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} catch (IOException e){}
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}
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```
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```java
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try(BufferedReader br = new BufferedReader(new FileReader("log.txt"));
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BufferedWriter bw = new BufferedWriter(new FileWriter("log.txt"))){
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} catch (IOException e){}
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```
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