如果方法A调用方法B，如果方法Ｂ的参数是基本数据类型或者String类型，那么方法Ａ向方法B传递参数的值，如果方法Ｂ的参数是对象或者数组，那么，方法Ａ向方法B传递参数的引用。

例子如下：

public class VariableTest {

public int membervariable = 0;

public static void main(String[] args){
int param1 = 0;
VariableTest param2 = new VariableTest();
VariableTest param3 = new VariableTest();
int[] param4= {0};
changeParameter(param1, param2, param3, param4);
System.out.println("param1="+param1);
System.out.println("param2.membervariable"+param2.membervariable);
System.out.println("param3.membervariable"+param3.membervariable);
System.out.println("param4[0]="+param4[0]);
}

public static void changeParameter(int param1,VariableTest param2,VariableTest param3,int[] param4){
param1 = 1;
param2.membervariable = 1;
param3 = new VariableTest();
param3.membervariable = 1;
param4[0] = 1;
}


}

打印结果：

param1=0
param2.membervariable1
param3.membervariable0
param4[0]=1