https://github.com/google/guava/guava: Guava is a suite of core and expanded libraries that include utility classes, google's collections, io classes, and much much more. 
public interface com.google.common.base.Supplier<T> extends java.util.function.Supplier<T>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.google.common.base.Supplier
  super_class: java.lang.Object
{
  public abstract T get();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: ()TT;
    RuntimeInvisibleAnnotations: 
      com.google.errorprone.annotations.CanIgnoreReturnValue()
}
Signature: <T:Ljava/lang/Object;>Ljava/lang/Object;Ljava/util/function/Supplier<TT;>;
SourceFile: "Supplier.java"
    RuntimeVisibleAnnotations: 
      java.lang.FunctionalInterface()
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.GwtCompatible()