问题

import com.itextpdf.kernel.pdf.PdfDocument
import com.itextpdf.kernel.pdf.PdfWriter
import com.itextpdf.layout.Document
import com.itextpdf.layout.element.Paragraph

class PDFService {
    fun generateSimplePdf(value: String) {
        println("I am generating a PDF for $value :)")
        
        val dest = "path_to_your_pdf_file.pdf"  // Replace with actual file path
        val writer = PdfWriter(dest)
        val pdfDoc = PdfDocument(writer)
        val doc = Document(pdfDoc)
        
        doc.add(Paragraph("Hello World!"))
        doc.close()
    }
}

Regarding your question about using Java inside Kotlin, the code you provided should work correctly since Kotlin is fully interoperable with Java. The key is to ensure that you're using the correct syntax for Kotlin.

However, there are a few corrections needed in your code snippet:

1. Replace println("I am generating a PDF for $value :)") with println("I am generating a PDF for $value :)").
2. You need to define the dest variable with the path where you want to save the generated PDF.
3. In the line val writer: PdfWriter(dest), it should be val writer = PdfWriter(dest).

As for general guidance on using Java inside Kotlin, the official Kotlin documentation provides information on how Kotlin interoperates with Java: Mixing Kotlin and Java. Additionally, you can refer to Java libraries' documentation and guides for usage in Kotlin, as the basic principles remain the same due to their interoperability.

//Initialize writer
PdfWriter writer = new PdfWriter(dest);

//Initialize document
PdfDocument pdfDoc = new PdfDocument(writer);
Document doc = new Document(pdfDoc);

//Add paragraph to the document
doc.add(new Paragraph("Hello World!"));

//Close document
doc.close();

import com.itextpdf.kernel.pdf.PdfDocument
import com.itextpdf.kernel.pdf.PdfWriter

class PDFService {
    
    fun generateSimplePdf(value: String) {
        println("I am generating a PDF for $value :)")
        val writer: PdfWriter(dest)

        val document: PdfDocument(writer)
    }
}

答案1

得分: 0

来自评论中的Tenfour04：

> 这与在 Kotlin 中使用 Java 类无关。你的 Kotlin
> 语法是错误的。使用 val write = PdfWriter(dest)。注意是 =，不是 :。
> 在你的 document 部分也是同样的情况。冒号用于指定类型。
> 等号用于赋值。类型通常可以省略，
> 因为它可以从你最初分配的内容中推断出来。