Leonardo :
I have this simple fragment that I would like to reengineer in a more elegant way maybe with the latest JDK 8 features:
String x = methodCall();
if(x==null) {x=method2();}
if(x==null) {x=method3();}
if(x==null) {x=method4();}
// doing calculation with X
Admit :
You can use Streams:
Optional<String> result= Stream.<Supplier<String>>of(this::method1, this::method2, this::method3)
.map(Supplier::get)
.filter(Objects::nonNull)
.findFirst();
System.out.println(result.isPresent());
The above code is equal to this (generated with Intellij Idea)
Optional<String> result = Optional.empty();
for (Supplier<String> stringSupplier : Arrays.<Supplier<String>>asList(this::method1, this::method2, this::method3)) {
String s = stringSupplier.get();
if (s != null) {
result = Optional.of(s);
break;
}
}
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