java只有值传递

值传递就是值参数只能有实参传给形参, 而不能由形参来改变实参.

而引用传递, 是可以由形参来改变实参.


class TestClass{
public TestClass(int i){
this.i = i;
}
private int i;

public int getI() {
return i;
}

public void setI(int i) {
this.i = i;
}

}
public class MyTest {
public void test(TestClass tc){
tc = new TestClass(110);
}
public static void main(String[] args){
TestClass tc = new TestClass(5);
        System.out.println(tc.getI());
MyTest pt = new MyTest();
pt.test(tc);
System.out.println(tc.getI());
}
}

输出

5
5