程序代码：

package huhu_520;

class testobject {
    private String name;
    public void setName(String pname) {
        name = pname;
    }

    public String getName() {
        return name;
    }
}


public class testit {
    private void modify(testobject ta, testobject tb) {
        ta.setName("xyz");
        tb.setName("uvw");
        System.out.println("in test...");
        System.out.println("ta.getName()=" + ta.getName());
        System.out.println("tb.getName()=" + tb.getName());
    }


    public static void main(String[] args) {
        testobject ta = new testobject();
        testobject tb = new testobject();

        testit tc = new testit();
        ta.setName("abc");
        tb.setName("def");
        System.out.println("before test....");
        System.out.println("ta.getName()=" + ta.getName());
        System.out.println("tb.getName()=" + tb.getName());
        tc.modify(ta, tb);
        System.out.println("after test...");
        System.out.println("ta.getName()=" + ta.getName());
        System.out.println("tb.getName()=" + tb.getName());
    }
}