java之String变量和“==”操作符（2）

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java 综合

Java

Java代码
public class StringTest2
{
    String s1 = "H";
    String s2 = "ello";
    String s3 = s1 + s2;
    String s4 = "H" + "ello";

    static String ss1 = "H";
    static String ss2 = "ello";
    static String ss3 = ss1 + ss2;
    static String ss4 = "H" + "ello";

    final String fs1 = "H";
    final String fs2 = "ello";
    final String fs3 = fs1 + fs2;
    final String fs4 = "H" + "ello";

    static final String sfs1 = "H";
    static final String sfs2 = "ello";
    static final String sfs3 = sfs1 + sfs2;
    static final String sfs4 = "H" + "ello";

    public static void main(String[] args)
    {
        StringTest2 st = new StringTest2();
        st.test1();
    }

    public void test1()
    {
        String str1 = "H";
        String str2 = "ello";
        String str3 = "Hello";
        String str4 = str1 + str2;
        String str5 = "H" + "ello";

        //1
        System.out.println(str3 == str4);
        System.out.println(str3 == str5);

        //2
        System.out.println();
        System.out.println(str3 == s3);
        System.out.println(str3 == s4);

        //3
        System.out.println();
        System.out.println(str3 == ss3);
        System.out.println(str3 == ss4);

        //4
        System.out.println();
        System.out.println(str3 == fs3);
        System.out.println(str3 == fs4);

        //5
        System.out.println();
        System.out.println(str3 == sfs3);
        System.out.println(str3 == sfs4);
    }
}

public class StringTest2
{
String s1 = "H";
String s2 = "ello";
String s3 = s1 + s2;
String s4 = "H" + "ello";

static String ss1 = "H";
static String ss2 = "ello";
static String ss3 = ss1 + ss2;
static String ss4 = "H" + "ello";

final String fs1 = "H";
final String fs2 = "ello";
final String fs3 = fs1 + fs2;
final String fs4 = "H" + "ello";

static final String sfs1 = "H";
static final String sfs2 = "ello";
static final String sfs3 = sfs1 + sfs2;
static final String sfs4 = "H" + "ello";

public static void main(String[] args)
{
StringTest2 st = new StringTest2();
st.test1();
}

public void test1()
{
String str1 = "H";
String str2 = "ello";
String str3 = "Hello";
String str4 = str1 + str2;
String str5 = "H" + "ello";

//1
System.out.println(str3 == str4);
System.out.println(str3 == str5);

//2
System.out.println();
System.out.println(str3 == s3);
System.out.println(str3 == s4);

//3
System.out.println();
System.out.println(str3 == ss3);
System.out.println(str3 == ss4);

//4
System.out.println();
System.out.println(str3 == fs3);
System.out.println(str3 == fs4);

//5
System.out.println();
System.out.println(str3 == sfs3);
System.out.println(str3 == sfs4);
}
}

输出如下：

Java代码
false
true

false
true

false
true

true
true

true
true

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java之String变量和“==”操作符（1） | java 之动态绑定和静态绑定

2010-11-26 23:18
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