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use initialization-on-demand holder idiom #55

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use initialization-on-demand holder idiom #55

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12 changes: 6 additions & 6 deletions src/main/java/jssc/SerialNativeAccess.java
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Original file line number Diff line number Diff line change
Expand Up @@ -38,16 +38,16 @@
public class SerialNativeAccess {
private int osType = -1;
private static SerialNativeInterface sni = new SerialNativeInterface();
private static SerialNativeAccess instance = null;

private static class LazyHolder {
private static final SerialNativeAccess INSTANCE = new SerialNativeAccess();
}

public static SerialNativeAccess getInstance() {
if (SerialNativeAccess.instance == null) {
SerialNativeAccess.instance = new SerialNativeAccess();
}
return SerialNativeAccess.instance;
return LazyHolder.INSTANCE;
}

public SerialNativeAccess() {
private SerialNativeAccess() {
String libFolderPath;
String libName;

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