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本帖最后由 回忆一遥远 于 2017-8-16 07:37 编辑
练习一
练习
- class T{
- int a;
- char b;
- }
- public class IniClas {
- public static void main(String[] args){
- T c = new T();
- System.out.println("a = " + c.a);
- System.out.println("b = " + c.b);
- }
- }
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输出
答
Java 类中的元素会执行默认初始化过程
练习二
练习+结果
练习三
练习 无结果
- class ATypeName{
- int a;
- }
- public class Test13 {
- public static void main(String[] args){
- ATypeName a = new ATypeName();
- a.a = 10;
- }
- }
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练习四
- class DataOnly{
- int i;
- double d;
- boolean b;
- }
- public class Test14 {
- public static void main(String[] args){
- DataOnly data = new DataOnly();
- data.i = 23;
- data.d = 2.4;
- data.b = false;
- }
- }
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练习五
练习
- class DataOnly{
- int i;
- double d;
- boolean b;
- }
- public class Test14 {
- public static void main(String[] args){
- DataOnly data = new DataOnly();
- data.i = 23;
- data.d = 2.4;
- data.b = false;
- System.out.println("i = " + data.i);
- System.out.println("d = " + data.d);
- System.out.println("b = " + data.b);
- }
- }
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结果
练习六
练习
- public class Test {
- static int storage(String s){
- return s.length() * 2;
- }
- public static void main(String[] args){
- System.out.println(storage("Hello"));
- }
- }
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结果
练习七
练习
- class StaticTest{
- static int i = 24;
- }
- class Incrementable{
- static void increment(){
- StaticTest.i++;
- }
- }
- public class Test {
- public static void main(String[] args){
- StaticTest st1 = new StaticTest();
- StaticTest st2 = new StaticTest();
- System.out.println("st1 = " + st1.i);
- System.out.println("str2 = " + st2.i);
- Incrementable sf = new Incrementable();
- sf.increment();
- System.out.println("st1 = " + st1.i);
- System.out.println("str2 = " + st2.i);
- }
- }
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结果
- st1 = 24
- str2 = 24
- st1 = 25
- str2 = 25
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