如何在javaparser中使用getRange获取源代码

import com.github.javaparser.Range;
import com.github.javaparser.ast.CompilationUnit;
import com.github.javaparser.ast.Node;

String sourceCode = "your source code";
CompilationUnit cu = JavaParser.parse(sourceCode);

Node node = cu.findNodeByPosition(startPosition);

Range range = node.getRange();