java 对象入参是传入的是引用(一块内存), 基础类型是值(复制内容),测试代码如下
public class TestA {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
public class TestB {
public void createTestA() {
int id = 100;
TestA testA = new TestA();
testA.setName("chenjun");
System.out.println("createTestA");
System.out.println(id);
System.out.println(testA.getName());
altTestA(testA, id);
System.out.println("after call altTestA");
System.out.println(id);
System.out.println(testA.getName());
}
public void altTestA(TestA testA, int id) {
testA.setName("zhanglan");
id = 200;
}
public static void main(String[] args) {
TestB test = new TestB();
test.createTestA();
}
}
运行结果
createTestA
100
chen
after call altTestA
100
zhang