一、while(true)和for(;;)分析

由字节码看，两者一致。

public class WhileForTest {
    public void forFunc() {
        for (;;) {
            System.out.println("for loop");
        }
    }

    public void whileFunc() {
        while (true) {
            System.out.println("while loop");
        }
    }
}

public class jmh/WhileForTest {

  // compiled from: WhileForTest.java

  // access flags 0x1
  public <init>()V
   L0
    LINENUMBER 7 L0
    ALOAD 0
    INVOKESPECIAL java/lang/Object.<init> ()V
    RETURN
   L1
    LOCALVARIABLE this Ljmh/WhileForTest; L0 L1 0
    MAXSTACK = 1
    MAXLOCALS = 1

  // access flags 0x1
  public forFunc()V
   L0
    LINENUMBER 10 L0
   FRAME SAME
    GETSTATIC java/lang/System.out : Ljava/io/PrintStream;
    LDC "for loop"
    INVOKEVIRTUAL java/io/PrintStream.println (Ljava/lang/String;)V
    GOTO L0
   L1
    LOCALVARIABLE this Ljmh/WhileForTest; L0 L1 0
    MAXSTACK = 2
    MAXLOCALS = 1

  // access flags 0x1
  public whileFunc()V
   L0
    LINENUMBER 16 L0
   FRAME SAME
    GETSTATIC java/lang/System.out : Ljava/io/PrintStream;
    LDC "while loop"
    INVOKEVIRTUAL java/io/PrintStream.println (Ljava/lang/String;)V
    GOTO L0
   L1
    LOCALVARIABLE this Ljmh/WhileForTest; L0 L1 0
    MAXSTACK = 2
    MAXLOCALS = 1
}