On the issue of exchanging two numbers

Walnuts, posterity

Contents of this lecture: about two numbers exchanged

for In Java, for a basic data type, Java passes a copy copy and cannot change the value of the parameter at all. You can do this through an array, because the array passes the address.

Example one:

public class Text {public    static void Main (string[] args) {      int a=4;    int b=5;        Change (A, b);          System.out.println ("main function:" +a+ "," +b);    }            public static void Change (int a, int b) {          int temp;          temp = A;          A = b;          b = temp;          SYSTEM.OUT.PRINTLN ("Swapped data:" + A + "," + b);      }  }

Output:

Data exchanged: 5, 4 main function: 4,5

Example two:

public static void Change (int a, int b) {      //In this implementation, only the two variables themselves are different//or implemented.          A = a ^ b;          b = a ^ b;          A = a ^ b;          SYSTEM.OUT.PRINTLN ("Swapped data:" + A + "," + b);      }  

Example three:

public static void Change (int a, int b) {      //In this implementation, only the two variables themselves are added minus the implementation.          A = a + B;          b = a A;          A = a-B;          SYSTEM.OUT.PRINTLN ("Swapped data:" + A + "," + b);   }  

Example four:

public class Text {public    static void Main (string[] args) {      int[] a = new int[2];        A[0] =4;        A[1] =5;        Change (A, 0, 1);        System.out.println ("main function:" +a[0]+ "," +a[1]);    }            public static void Change (int[] A, int x, int y) {       int temp = a[x];         A[X] = A[y];         A[y] = temp;         System.out.println ("Post-Exchange data:");        System.out.println ("x=" + a[0]);        System.out.println ("y=" + a[1]);    }  }

Output:

Data exchanged: x=5y=4 main function: 5,4

This is where we go, take your time and enjoy it

On the issue of exchanging two numbers