缥缈止盈
switch不是循环,代码走到case 1遇到break;后自然会中断switch并执行switch之后的代码。如果你非要这样做,可以利用java引用对象来做。静态变量(全局引用,一次实例化)12345678910111213141516171819202122232425public class $ { public static Test t = new Test(); public static void main(String[] args) { test(1); test(2); } public static void test(int i) { switch (i) { case 1: if(t == null) t = new Test(); t.str = "你好"; break; case 2: System.out.println(t.str); break; default: break; } }}class Test { int a = 12; String str = "Hello";}或者将对象带入方法(带入方法的对象必须保证不为null,否则空指针异常)12345678910111213141516171819202122232425public class $ { public static void main(String[] args) { Test t = new Test(); test(t, 1); test(t, 2); } public static void test(Test t, int i) { switch (i) { case 1: if(t == null) t = new Test(); t.str = "你好"; break; case 2: System.out.println(t.str); break; default: break; } }}class Test { int a = 12; String str = "Hello";}