String类

public class StringDemo01{51Testing软件测试网lpDq$Jy3nu&N.c

    public static void main(String[] args){51Testing软件测试网 ob K(xe$@a

        String name = "LiXingHua" ; //表示将一个堆内存空间的指向给了栈内在空间

        System.out.pringln("姓名： " + name) ;

    } 51Testing软件测试网Bm5y!N}/`:z_CT _

}

 51Testing软件测试网 ? MuS%F

  public class StringDemo02{51Testing软件测试网B~&mr\c9O5M

    public static void main(String[] args){

        String name = new String("LiXingHua") ;

        System.out.pringln("姓名： " + name) ; 51Testing软件测试网O zpf%ho eK5\`C8qm

    }

}51Testing软件测试网2{B$B7Vg n-j E Dc$B g

 51Testing软件测试网h!|;N^)u}$V3[s

使用直接赋值的方式只城西 个实例化对象即可，而使用new String()的方式则意味着要开辟两个内存对象，开发中最好使用直接赋值方式完成；

    public class StringDemo07{51Testing软件测试网s
AKq _i7]s)F

        public static void main(String[] args){

           String str1 = "hello" ;

           String str2 =  "hello" ;51Testing软件测试网-h2U?}weL

           String str3 =  "hello" ;51Testing软件测试网9y-V w&Y zyU

            System.out.println("str1 == str2 --> " + (str1==str2)) ; 51Testing软件测试网X${JvT:JO&I#O"O"T}

            System.out.println("str1 == str3 --> " + (str1==str3)) ;

            System.out.println("str2 == str3 --> " + (str2==str3)) ;

        } 51Testing软件测试网dK
E;PU Lw?0`0m

    }

 51Testing软件测试网3AITk2N~

str1 == str2 --> true

str1 == str3 --> true51Testing软件测试网.U6iY-`,o?*x:s n

str2 == str3 --> true51Testing软件测试网-wfD'd"cJY

public class StringDemo02{51Testing软件测试网r'`!}2_6HW4e9b8j

        public static void main(String[] args){

           int x = 30 ;

           int y = 30 ;51Testing软件测试网#B|0B'MPX?#uz

            System.out.println("两个数字的比较结果 " + (x==y)) ; 51Testing软件测试网;P;JvbV%Q(~k|

        }

    }51Testing软件测试网NE$v5R5P4y$C
d

    public class StringDemo04{

        public static void main(String[] args){

           String str1 = "hello" ;

           String str2 = new String("hello") ;

           String str3 = str2 ;51Testing软件测试网W+PI9}H

            System.out.println("str1 == str2 --> " + (str1==str2)) ; 51Testing软件测试网&wc?y:C a3K;A1VQ:u

            System.out.println("str1 == str3 --> " + (str1==str3)) ;51Testing软件测试网hvp7N&R5B

            System.out.println("str2 == str3 --> " + (str2==str3)) ;

        }

    }

str1 == str2 --> false

str1 == str3 --> false51Testing软件测试网l l
\Qw)H a

str2 == str3 --> true

    public class StringDemo05{

        public static void main(String[] args){51Testing软件测试网$\[)PWZ:}

           String str1 = "hello" ;

           String str2 = new String("hello") ;

           String str3 = str2 ;51Testing软件测试网`$Bcw*Z Z}6]

            System.out.println("str1 equals str2 --> " + str1.equals(str2)) ; 51Testing软件测试网fB8`X"y!u

            System.out.println("str1 equals str3 --> " + str1.equals(str3)) ;51Testing软件测试网2s:Ji.WqvV$K

            System.out.println("str2 equals str3 --> " + str2.equals(str3)) ;

        }

    }51Testing软件测试网3d {Z,V T&q

str1 equals str2 --> true

str1 equals str3 --> true51Testing软件测试网%Hr]0Bky/\+?

str2 equals str3 --> true