//Sample03_01.java

class Sample03_01{
    public static void main(String[] args){
      StringBuilder sb1 = new StringBuilder();

      sb1.append("緑間です。");
      System.out.println("sb1: " + sb1.toString());
      sb1.append("青峰です。");
      System.out.println("sb1: " + sb1.toString());

      System.out.println("--------------");

      StringBuilder sb2 = sb1.append("赤司です。");
      System.out.println("sb1: " + sb1.toString());
      System.out.println("sb2: " + sb2.toString());

      System.out.println("--------------");

      sb1.append("紫原どこ行った？");
      System.out.println("sb1: " + sb1.toString());
      System.out.println("sb2: " + sb2.toString());
    }
}