jdk.imports['java.lang.StringBuilder'].load = async () => { class StringBuilder { constructor() { this._str = ''; } append(val) { this._str = this._str + val; return this; } insert(position, val) { this._str = this._str.slice(0, position) + val + this._str.slice(position); return this; } toString() { return this._str; } } jdk.java.lang.StringBuilder = StringBuilder; };