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View Compilation Error

0_0_1862004_5982\Main.java:34: 找不到符号
符号: 类 balloon
位置: 类 Main
	private static List<balloon> balloons;
	                    ^
0_0_1862004_5982\Main.java:38: 找不到符号
符号: 类 balloon
位置: 类 Main
	public static List<balloon> getBalloons(int n) {
	                   ^
0_0_1862004_5982\Main.java:39: 找不到符号
符号: 类 balloon
位置: 类 Main
		balloons = new ArrayList<balloon>();
		                         ^
0_0_1862004_5982\Main.java:47: 运算符 + 不能应用于 balloon.getNum,int
					balloons.get(j).setNum(balloons.get(j).getNum() + 1);
					                                             ^
4 错误


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