java中的String定义的字面量最大长度是多少

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStream;
 
import javax.tools.JavaCompiler;
import javax.tools.ToolProvider;
 
public class LiteralLength {
 
 public static void main(String[] args) throws Exception {
 String fileName = "D:/Literal.java";
 StringBuilder prefix = new StringBuilder();
 prefix.append("public class Literal{ String s = \"");
 int low = 0;
 int high = 100_0000;
 int mid = (low + high)/2;
 StringBuilder literal = new StringBuilder(high);
 
 int result;
 
 String ch = "A";
 JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
 //自定义错误输出流 取代System的err
 OutputStream err = new OutputStream() {
  
  @Override
  public void write(int b) throws IOException {
  
  
  }
 };
 
 int max = 0;
 for (int i = 0; i < mid; i++) {
  literal.append(ch);
 }
 while(low <= high){
  StringBuilder fileContent 
        = new StringBuilder(literal.length() + prefix.length() * 2);
  fileContent.append(prefix);
  fileContent.append(literal);
  fileContent.append("\";}");
  FileWriter w = new FileWriter(fileName);
  BufferedWriter bw = new BufferedWriter(w);
  bw.write(fileContent.toString());
  bw.close();
  w.close();//生成java文件
  result = compiler.run(null, null, err, fileName);
  
  //代码点的数量
  int codePointCount = literal.codePointCount(0, literal.length());
  if(result == 0){//0表示没有编译错误
  low = mid + 1;
  mid = (low + high)/2;
  max = codePointCount;
  for (int i = codePointCount; i < mid; i++) {
   literal.append(ch);
  }
  System.out.println("长度" + max 
            + "编译成功，增加长度至" + mid);
  
  }else{
  //编译错误，说明字面量太长
  high = mid - 1;
  mid = (low + high)/2;
  System.err.println("长度" + codePointCount 
            + "编译失败，减少长度至" + mid);
  int start = ch.length() == 1? mid : mid *2;
  literal.delete(start, literal.length());
  }
 }
 err.close();
 System.out.println("最大字面量长度：" + max);
 
 
 }
}

String ch = "α";