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class Tank { int level;} public class TestTank { public static void main(String[] args) { Tank t1 = new Tank(); Tank t2 = new Tank(); t1.level = 9; t2.level = 47; System.out.println("1: t1.level: " + t1.level + ", t2.level: " + t2.level); t1 = t2; System.out.println("2: t1.level: " + t1.level + ", t2.level: " + t2.level); t1.level = 27; System.out.println("3: t1.level: " + t1.level + ", t2.level: " + t2.level); }}
答案：1: t1.level: 9, t2.level: 472: t1.level: 47, t2.level: 473: ...
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