[原创]Java 的传值小例子

public class Test {

    static classB {
       public int i = 0;
       public String s = "0";
    }

    publicstatic void main(String[] args) {
       int i = 0;
       change1(i);
       System.out.println(i);                         //0

       String a = "0";
       change2(a);
       System.out.println(a);                         //0

       B b1 = new B();
       change3(b1);
       System.out.println(b1.i + "   " +b1.s);       //100 100


       B b2 = new B();
       change4(b2);
       System.out.println(b2.i + "   " +b2.s);       //0 0
        
       int[] c1 = new int[]{0};
       change5(c1);
       System.out.println(c1[0]);                     //100
        
       int[] c2 = new int[]{0};
       change6(c2);
       System.out.println(c2[0]);                     //0
    }

    publicstatic void change1(int i) {
       i = 100;
    }

    publicstatic void change2(String a) {
       a = "100";
    }

    publicstatic void change3(B b) {
       b.i = 100;
       b.s = "100";
    }

    publicstatic void change4(B b) {
       b = new B();
       b.i = 100;
       b.s = "100";
    }
    
    publicstatic void change5(int[] c){        
       c[0] = 100;
    }
    
    publicstatic void change6(int[] c) { 
       c = newint[]{100};        
    }
}