张孝祥IT课堂-《Java就业培训教程》书籍源码03

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1、《Java就业培训教程》P81源码 classCompare { publicstaticvoidmain(String[]args) { Stringstr1=newString("abc"); Stringstr2=newString("abc"); Stringstr3=str1; if(str1==str2) System.out.println("str1==str2"); else System.out.println("str1!=str2"); if(str1==str3) System.ou

2、t.println("str1==str3"); else System.out.println("str1!=str3"); } } 《Java就业培训教程》P82源码 classCompare { publicstaticvoidmain(String[]args) { Stringstr1=newString("abc"); Stringstr2=newString("abc"); Stringstr3=str1; if(str1.equals(str2)) System.out.println("s

3、tr1equalstr2"); else System.out.println("str1notequalstr2"); if(str1.equals(str3)) System.out.println("str1equalstr3"); else System.out.println("str1notequalstr3"); } } 《Java就业培训教程》P86源码 classPerson { privateintage; publicvoidsetAge(inti) { if(i<0

4、

5、i>130)

6、return; age=i; } publicintgetAge() { returnage; } } publicclassTestPerson { publicstaticvoidmain(Stringargs[]) { Personp1=newPerson(); p1.setAge(3); p1.setAge(-6); System.out.println(p1.getAge()); } } 《Java就业培训教程》P88源码 classPerson { publicPerson() { System

7、.out.println("theconstructor1iscalling!"); } privateintage=10; publicvoidshout() { System.out.println("ageis"+age); } } classTestPerson { publicstaticvoidmain(String[]args) { Personp1=newPerson(); p1.shout(); Personp2=newPerson(); p2.shout(); Personp3=newPe

8、rson(); p3.shout(); } } 《Java就业培训教程》P90源码 classPerson { privateStringname="unknown"; privateintage=-1; publicPerson() { System.out.println("constructor1iscalling"); } publicPerson(Stringn) { name=n; System.out.println("constructor2iscalling"); System.out.p

9、rintln("nameis"+name); } publicPerson(Stringn,inta) { name=n; age=a; System.out.println("constructor3iscalling"); System.out.println("nameandageis"+name+";"+age); } publicvoidshout() { System.out.println("listentome!!"); } } classTestPerson { publicstaticvo

10、idmain(String[]args) { Personp1=newPerson(); P1.shout(); Personp2=newPerson("Jack"); P2.shout(); Personp3=newPerson("Tom",18); P3.shout(); } } 《Java就业培训教程》P94源码 classPerson { privatePerson() { System.o