Minor cleanup

This commit is contained in:
Erik C. Thauvin 2023-04-15 09:27:30 -07:00
parent e2126624f4
commit 73eb6333d2
12 changed files with 338 additions and 61 deletions

View file

@ -23,15 +23,15 @@ package java;
* @since 1.0
*/
public class BestPractices {
private final String ip = "127.0.0.1"; // not recommended
private StringBuffer buffer; // potential memory leak as an instance variable;
private final String ip = "127.0.0.1"; // not recommended
private StringBuffer buffer; // potential memory leak as an instance variable;
private String[] x;
void bar(int a) {
switch (a) {
case 1: // do something
case 1: // do something
break;
default: // the default case should be last, by convention
default: // the default case should be last, by convention
break;
case 2:
break;
@ -47,6 +47,4 @@ public class BestPractices {
name = name.trim();
System.out.println("Hello " + name);
}
}

View file

@ -25,7 +25,7 @@ package java;
public final class CodeStyle {
final int FinalField = 1;
private int x;
private int y; // class cannot be subclassed, so is y really private or package visible?
private int y; // class cannot be subclassed, so is y really private or package visible?
// missing constructor

View file

@ -26,10 +26,6 @@ public class Design {
String field;
int otherField;
void foo() {
throw new NullPointerException();
}
public void bar(int x, int y, int z) {
if (x > y) {
if (y > z) {
@ -39,4 +35,8 @@ public class Design {
}
}
}
void foo() {
throw new NullPointerException();
}
}

View file

@ -37,18 +37,18 @@ public class ErrorProne {
}
}
void foo() {
try {
// do something
} catch (Throwable th) { // should not catch Throwable
th.printStackTrace();
}
}
void bar() {
try {
// do something
} catch (NullPointerException npe) {
}
}
void foo() {
try {
// do something
} catch (Throwable th) { // should not catch Throwable
th.printStackTrace();
}
}
}

View file

@ -33,12 +33,6 @@ public class MultiThreading {
sdf.format("bar"); // poor, no thread-safety
}
void foo() {
synchronized (sdf) { // preferred
sdf.format("foo");
}
}
Object obj() {
if (baz == null) { // baz may be non-null yet not fully created
synchronized (this) {

View file

@ -29,7 +29,6 @@ public class Performance {
}
}
private boolean checkTrimEmpty(String str) {
for (int i = 0; i < str.length(); i++) {
if (!Character.isWhitespace(str.charAt(i))) {
@ -41,7 +40,7 @@ public class Performance {
void foo() {
StringBuffer sb = new StringBuffer();
sb.append("a"); // avoid this
sb.append("a"); // avoid this
String foo = " ";
StringBuffer buf = new StringBuffer();
@ -51,7 +50,6 @@ public class Performance {
buf.append("Hello").append(" ").append("World");
StringBuffer sbuf = new StringBuffer("tmp = " + System.getProperty("java.io.tmpdir"));
// poor
StringBuffer sbuf = new StringBuffer("tmp = " + System.getProperty("java.io.tmpdir")); // poor
}
}