值类型和引用类型
public static void main(String[] args) { setValue();// 1 setValue2();// 100 } static void setValue() { int[] i = new int[1]; i[0] = 100; setA(i); System.out.println(i[0]); } static void setValue2() { int i = 100; setA(i); System.out.println(i); } //// static void setA(int[] x) { x[0] = 1; } static void setA(int x) { x = 1; }