if(foo!=null){
  if(foo.getBar()!=null){
    Bar bar = foo.getBar();
    System.out.println("Success: " + bar);
  } else {
    System.out.println("Failure.");
  }
} else {
  System.out.println("Failure.");
}

if(foo!=null && foo.getBar()!=null){
  Bar bar = foo.getBar();
  System.out.println("Success: " + bar);
} else {
  System.out.println("Failure.");
}

if(foo!=null && (Bar bar = foo.getBar())!=null){
  Bar bar = foo.getBar();
  System.out.println("Success: " + bar);
} else {
  System.out.println("Failure.");
}

Bar bar = foo.getBar();
if (bar!=null) ...

Bar bar;
if(foo!=null && (bar = foo.getBar())!=null){
  System.out.println("Success: " + bar);
} else {
  System.out.println("Failiure.");
}

BufferedReader br = // create reader
String line
while ((line = br.readLine()) != null) {
    // process the line
}

Bar bar = foo?.bar
if (bar != null) {
}

Bar bar = foo?.bar
if (bar != null) {
}

Bar bar = foo == null ? null : foo.getBar();
if (bar != null) {
}

Optional.ofNullable("text").ifPresent( $0 -> {
  System.out.println($0.toUpperCase());
});

if(foo != null){
      Optional.ofNullable(foo.getBar()).ifPresent(bar -> {
          System.out.println("Success: " + bar);
      });
  }