https://freemarker.apache.org/: FreeMarker is a "template engine"; a generic tool to generate text output based on templates. (Apache Software Foundation) 
public class freemarker.cache.StringTemplateLoader implements freemarker.cache.TemplateLoader
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: freemarker.cache.StringTemplateLoader
  super_class: java.lang.Object
{
  private final java.util.Map<java.lang.String, freemarker.cache.StringTemplateLoader$StringTemplateSource> templates;
    descriptor: Ljava/util/Map;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/util/Map<Ljava/lang/String;Lfreemarker/cache/StringTemplateLoader$StringTemplateSource;>;

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // freemarker.cache.StringTemplateLoader this
         0: .line 62
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 64
            aload 0 /* this */
            new java.util.HashMap
            dup
            invokespecial java.util.HashMap.<init>:()V
            putfield freemarker.cache.StringTemplateLoader.templates:Ljava/util/Map;
         2: .line 62
            return
        end local 0 // freemarker.cache.StringTemplateLoader this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lfreemarker/cache/StringTemplateLoader;

  public void putTemplate(java.lang.String, java.lang.String);
    descriptor: (Ljava/lang/String;Ljava/lang/String;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=3, args_size=3
        start local 0 // freemarker.cache.StringTemplateLoader this
        start local 1 // java.lang.String name
        start local 2 // java.lang.String templateContent
         0: .line 78
            aload 0 /* this */
            aload 1 /* name */
            aload 2 /* templateContent */
            invokestatic java.lang.System.currentTimeMillis:()J
            invokevirtual freemarker.cache.StringTemplateLoader.putTemplate:(Ljava/lang/String;Ljava/lang/String;J)V
         1: .line 79
            return
        end local 2 // java.lang.String templateContent
        end local 1 // java.lang.String name
        end local 0 // freemarker.cache.StringTemplateLoader this
      LocalVariableTable:
        Start  End  Slot             Name  Signature
            0    2     0             this  Lfreemarker/cache/StringTemplateLoader;
            0    2     1             name  Ljava/lang/String;
            0    2     2  templateContent  Ljava/lang/String;
    MethodParameters:
                 Name  Flags
      name             
      templateContent  

  public void putTemplate(java.lang.String, java.lang.String, long);
    descriptor: (Ljava/lang/String;Ljava/lang/String;J)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=8, locals=5, args_size=4
        start local 0 // freemarker.cache.StringTemplateLoader this
        start local 1 // java.lang.String name
        start local 2 // java.lang.String templateContent
        start local 3 // long lastModified
         0: .line 101
            aload 0 /* this */
            getfield freemarker.cache.StringTemplateLoader.templates:Ljava/util/Map;
            aload 1 /* name */
            new freemarker.cache.StringTemplateLoader$StringTemplateSource
            dup
            aload 1 /* name */
            aload 2 /* templateContent */
            lload 3 /* lastModified */
            invokespecial freemarker.cache.StringTemplateLoader$StringTemplateSource.<init>:(Ljava/lang/String;Ljava/lang/String;J)V
            invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         1: .line 102
            return
        end local 3 // long lastModified
        end local 2 // java.lang.String templateContent
        end local 1 // java.lang.String name
        end local 0 // freemarker.cache.StringTemplateLoader this
      LocalVariableTable:
        Start  End  Slot             Name  Signature
            0    2     0             this  Lfreemarker/cache/StringTemplateLoader;
            0    2     1             name  Ljava/lang/String;
            0    2     2  templateContent  Ljava/lang/String;
            0    2     3     lastModified  J
    MethodParameters:
                 Name  Flags
      name             
      templateContent  
      lastModified     

  public boolean removeTemplate(java.lang.String);
    descriptor: (Ljava/lang/String;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // freemarker.cache.StringTemplateLoader this
        start local 1 // java.lang.String name
         0: .line 117
            aload 0 /* this */
            getfield freemarker.cache.StringTemplateLoader.templates:Ljava/util/Map;
            aload 1 /* name */
            invokeinterface java.util.Map.remove:(Ljava/lang/Object;)Ljava/lang/Object;
            ifnull 1
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_0
            ireturn
        end local 1 // java.lang.String name
        end local 0 // freemarker.cache.StringTemplateLoader this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lfreemarker/cache/StringTemplateLoader;
            0    2     1  name  Ljava/lang/String;
    MethodParameters:
      Name  Flags
      name  

  public void closeTemplateSource(java.lang.Object);
    descriptor: (Ljava/lang/Object;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=0, locals=2, args_size=2
        start local 0 // freemarker.cache.StringTemplateLoader this
        start local 1 // java.lang.Object templateSource
         0: .line 121
            return
        end local 1 // java.lang.Object templateSource
        end local 0 // freemarker.cache.StringTemplateLoader this
      LocalVariableTable:
        Start  End  Slot            Name  Signature
            0    1     0            this  Lfreemarker/cache/StringTemplateLoader;
            0    1     1  templateSource  Ljava/lang/Object;
    MethodParameters:
                Name  Flags
      templateSource  

  public java.lang.Object findTemplateSource(java.lang.String);
    descriptor: (Ljava/lang/String;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // freemarker.cache.StringTemplateLoader this
        start local 1 // java.lang.String name
         0: .line 124
            aload 0 /* this */
            getfield freemarker.cache.StringTemplateLoader.templates:Ljava/util/Map;
            aload 1 /* name */
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            areturn
        end local 1 // java.lang.String name
        end local 0 // freemarker.cache.StringTemplateLoader this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lfreemarker/cache/StringTemplateLoader;
            0    1     1  name  Ljava/lang/String;
    MethodParameters:
      Name  Flags
      name  

  public long getLastModified(java.lang.Object);
    descriptor: (Ljava/lang/Object;)J
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // freemarker.cache.StringTemplateLoader this
        start local 1 // java.lang.Object templateSource
         0: .line 128
            aload 1 /* templateSource */
            checkcast freemarker.cache.StringTemplateLoader$StringTemplateSource
            getfield freemarker.cache.StringTemplateLoader$StringTemplateSource.lastModified:J
            lreturn
        end local 1 // java.lang.Object templateSource
        end local 0 // freemarker.cache.StringTemplateLoader this
      LocalVariableTable:
        Start  End  Slot            Name  Signature
            0    1     0            this  Lfreemarker/cache/StringTemplateLoader;
            0    1     1  templateSource  Ljava/lang/Object;
    MethodParameters:
                Name  Flags
      templateSource  

  public java.io.Reader getReader(java.lang.Object, java.lang.String);
    descriptor: (Ljava/lang/Object;Ljava/lang/String;)Ljava/io/Reader;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // freemarker.cache.StringTemplateLoader this
        start local 1 // java.lang.Object templateSource
        start local 2 // java.lang.String encoding
         0: .line 132
            new java.io.StringReader
            dup
            aload 1 /* templateSource */
            checkcast freemarker.cache.StringTemplateLoader$StringTemplateSource
            getfield freemarker.cache.StringTemplateLoader$StringTemplateSource.templateContent:Ljava/lang/String;
            invokespecial java.io.StringReader.<init>:(Ljava/lang/String;)V
            areturn
        end local 2 // java.lang.String encoding
        end local 1 // java.lang.Object templateSource
        end local 0 // freemarker.cache.StringTemplateLoader this
      LocalVariableTable:
        Start  End  Slot            Name  Signature
            0    1     0            this  Lfreemarker/cache/StringTemplateLoader;
            0    1     1  templateSource  Ljava/lang/Object;
            0    1     2        encoding  Ljava/lang/String;
    MethodParameters:
                Name  Flags
      templateSource  
      encoding        

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=5, args_size=1
        start local 0 // freemarker.cache.StringTemplateLoader this
         0: .line 195
            new java.lang.StringBuilder
            dup
            invokespecial java.lang.StringBuilder.<init>:()V
            astore 1 /* sb */
        start local 1 // java.lang.StringBuilder sb
         1: .line 196
            aload 1 /* sb */
            aload 0 /* this */
            invokestatic freemarker.cache.TemplateLoaderUtils.getClassNameForToString:(Lfreemarker/cache/TemplateLoader;)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
         2: .line 197
            aload 1 /* sb */
            ldc "(Map { "
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
         3: .line 198
            iconst_0
            istore 2 /* cnt */
        start local 2 // int cnt
         4: .line 199
            aload 0 /* this */
            getfield freemarker.cache.StringTemplateLoader.templates:Ljava/util/Map;
            invokeinterface java.util.Map.keySet:()Ljava/util/Set;
            invokeinterface java.util.Set.iterator:()Ljava/util/Iterator;
            astore 4
            goto 14
      StackMap locals: freemarker.cache.StringTemplateLoader java.lang.StringBuilder int top java.util.Iterator
      StackMap stack:
         5: aload 4
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            checkcast java.lang.String
            astore 3 /* name */
        start local 3 // java.lang.String name
         6: .line 200
            iinc 2 /* cnt */ 1
         7: .line 201
            iload 2 /* cnt */
            iconst_1
            if_icmpeq 9
         8: .line 202
            aload 1 /* sb */
            ldc ", "
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
         9: .line 204
      StackMap locals: freemarker.cache.StringTemplateLoader java.lang.StringBuilder int java.lang.String java.util.Iterator
      StackMap stack:
            iload 2 /* cnt */
            bipush 10
            if_icmple 12
        10: .line 205
            aload 1 /* sb */
            ldc "..."
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
        11: .line 206
            goto 15
        12: .line 208
      StackMap locals:
      StackMap stack:
            aload 1 /* sb */
            aload 3 /* name */
            invokestatic freemarker.template.utility.StringUtil.jQuote:(Ljava/lang/String;)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
        13: .line 209
            aload 1 /* sb */
            ldc "=..."
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
        end local 3 // java.lang.String name
        14: .line 199
      StackMap locals: freemarker.cache.StringTemplateLoader java.lang.StringBuilder int top java.util.Iterator
      StackMap stack:
            aload 4
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 5
        15: .line 211
      StackMap locals: freemarker.cache.StringTemplateLoader java.lang.StringBuilder int
      StackMap stack:
            iload 2 /* cnt */
            ifeq 17
        16: .line 212
            aload 1 /* sb */
            bipush 32
            invokevirtual java.lang.StringBuilder.append:(C)Ljava/lang/StringBuilder;
            pop
        17: .line 214
      StackMap locals:
      StackMap stack:
            aload 1 /* sb */
            ldc "})"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
        18: .line 215
            aload 1 /* sb */
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            areturn
        end local 2 // int cnt
        end local 1 // java.lang.StringBuilder sb
        end local 0 // freemarker.cache.StringTemplateLoader this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0   19     0  this  Lfreemarker/cache/StringTemplateLoader;
            1   19     1    sb  Ljava/lang/StringBuilder;
            4   19     2   cnt  I
            6   14     3  name  Ljava/lang/String;
}
SourceFile: "StringTemplateLoader.java"
NestMembers:
  freemarker.cache.StringTemplateLoader$StringTemplateSource
InnerClasses:
  private StringTemplateSource = freemarker.cache.StringTemplateLoader$StringTemplateSource of freemarker.cache.StringTemplateLoader