https://openjdk.java.net/ 
public interface java.beans.DesignMode
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: java.beans.DesignMode
  super_class: java.lang.Object
{
  public static final java.lang.String PROPERTYNAME;
    descriptor: Ljava/lang/String;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: "designTime"

  public abstract void setDesignTime(boolean);
    descriptor: (Z)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
            Name  Flags
      designTime  

  public abstract boolean isDesignTime();
    descriptor: ()Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "DesignMode.java"