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public class Test {public static void swap(int a , int b){int tmp a;a b;b tmp;
}public static void main(String[] args) {int x 10;int y 20;swap(x,y);System.out.println(x);System.out.println(y);}
}JAVA 当中无法获取到 局部变量的地址.
实参和形参的关系就像榨汁机一样,丢进去的是橙子,出来的是橙汁.
public class Test {public static void main(String[] args) {int[] arr {10,20};swap(arr);System.out.println(arr[0] arr[0] arr[1] arr[1] );}public static void swap(int[] arr) {int tmp arr[0];arr[0] arr[1];arr[1] tmp;}
}虽然数组通过下标可以交换它的位置,但它的内存地址并未发生改变.所以说,数组不能传某一块的内存地址.
return 代表法方的结束.return后的代码不会被执行. 方法重载
public class Test {public static double add(double d , double c){return d c;}// Overload 重载public static int add(int d , int c){return d c;}public static long add(long d , int c){return d c;}public static long add(long d , int c , int b){return d c;}public static void main(String[] args) {int x 10;int y 20;int ret add(x, y);System.out.println(ret);double d1 10.5;double d2 12.5;double dd add(d1, d2);System.out.println(dd);}}根据上面的代码我们可以知道,方法的重载遵循以下原则: (1)方法名一样. (2)方法的参数列表不一样[个数,数据类型,顺序] (3)返回值是否一样,不影响方法重载. ___
EXERCISES1-模拟登录 public class X {public static void main(String[] args) {int count 3;Scanner scanner new Scanner(System.in);while (count ! 0) {System.out.println(请输入您的密码);String password scanner.nextLine();if (password.equals(123456)) {System.out.println(登陆成功);return; // 通过 return退出程序} else {System.out.println(输入错误,请重新登录);count--;}}System.out.println(程序已退出);}
}
