参数传递的问题：

Posted 2020-10-25 lcs-java

public static void main(String[] args) {
      int a = 10;
      int b = 20;
      change(a,b);
      System.out.println("a:"+a+",b:"+b);    //a:10,b:20
}

 

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public static void main(String[] args) {

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      int a = 10;

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      int b = 20;

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      change(a,b);

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      System.out.println("a:"+a+",b:"+b);    //a:10,b:20

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}

   public static void change(int a, int b) {
      a = b;
      b = a + b;
      System.out.println("a:"+a+",b:"+b);            //a:20,b:40
}

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   public static void change(int a, int b) {

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      a = b;

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      b = a + b;

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      System.out.println("a:"+a+",b:"+b);            //a:20,b:40

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}

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