java中参数传递

package com.cc;

public class Hello {

public static void main(String[] args) {

String a = "String";

StringBuffer b = new StringBuffer("StringBuffer");

methodA(a);

methodB(b);

System.out.println(a);//String

System.out.println(b);//StringBuffer

int c = 10;

methodC(c);

System.out.println(c);//10

}

public static void methodA(String str){

str = new String("newString");

System.out.println("methodA中 ： " + str);

}

public static void methodB(StringBuffer str){

str = new StringBuffer("newStringBuffer");

System.out.println("methodA中 ： " + str);

}

public static void methodC(int i){

i = 20;

System.out.println("methodA中 ： " + i);

}

}