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74 lines (53 loc) · 1.51 KB
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package com.qb.israel.inheritance;
public class TestClass
{
public void testRefs(String str, StringBuilder sb)
{
str = null;
str = str + sb.toString();
sb.append(str);
str = null;
sb = null;
System.out.println(str);
}
public static void changeNumber(Number n) {
n = new Number();
n.setNumber(10);
}
public static void changeInteger(Integer i) {
i = 5;
}
public static void stringTest(String sr){
sr = null;
}
public static void changeDouble(Double d) {
d = 6.7;
}
public static void main(String[] args)
{
String s = "aaa";
StringBuilder sb = new StringBuilder("bbb");
new TestClass().testRefs(s, sb);
System.out.println("s="+s+" sb="+sb);
String hola = "Hola";
stringTest(hola);
System.out.println(hola);
Number number = new Number();
number.setNumber(50);
System.out.println(number.getNumber());
changeNumber(number);
System.out.println(number.getNumber());
Integer integer = new Integer("50");
System.out.println(integer);
changeInteger(integer);
System.out.println(integer);
Double d = 5.0;
System.out.println(d);
changeDouble(d);
System.out.println(d);
String st = "Hola";
System.out.println(st);
st = "adios";
System.out.println(st);
}
}