import cn.nukkit.level.generator.populator.tree.JungleTreePopulator; //导入依赖的package包/类
public JungleBiome() {
    super();
    JungleTreePopulator trees = new JungleTreePopulator();
    JungleBigTreePopulator bigTrees = new JungleBigTreePopulator();
    trees.setBaseAmount(10);
    bigTrees.setBaseAmount(6);
    //PopulatorTallGrass tallGrass = new PopulatorTallGrass();

    PopulatorGrass grass = new PopulatorGrass();
    grass.setBaseAmount(20);

    //PopulatorFern fern = new PopulatorFern();
    //fern.setBaseAmount(30);

    this.addPopulator(grass);
    //this.addPopulator(fern);
    this.addPopulator(bigTrees);
    this.addPopulator(trees);
    this.setElevation(62, 63);
    this.temperature = 1.2f;
    this.rainfall = 0.9f;
}